This standard specifies the relevant technical requirements for copper electroplating for engineering use on metal substrates. This standard applies to copper electroplating for engineering use, such as copper electroplating that acts as a barrier layer on the surface of heat-treated parts; copper electroplating that is required to reduce friction during wire drawing; copper electroplating that is used as the bottom layer of tin plating to prevent the diffusion of base metal, etc. This standard does not apply to copper electroplating and copper bottom layers for decorative purposes and copper plating for electroforming. GB 12333-1990 Copper electroplating for engineering metal covering GB12333-1990 Standard download decompression password: www.bzxz.net
This standard specifies the relevant technical requirements for copper electroplating for engineering use on metal substrates. This standard applies to copper electroplating for engineering use, such as copper electroplating that acts as a barrier layer on the surface of heat-treated parts; copper electroplating that is required to reduce friction during wire drawing; copper electroplating that is used as the bottom layer of tin plating to prevent the diffusion of base metal, etc. This standard does not apply to copper electroplating layers and copper base layers for decorative purposes and copper plating layers for electroforming.

National Standard of the People's Republic of China
Electroplated coatings of copper for engincering purposes
Metallic coatings-Electroplated coatings of copper for engincering purposes
1 Subject content and scope of application
This standard specifies the relevant technical requirements for electroplated copper coatings for engineering purposes on metal bodies. 90
GB12333
This standard applies to copper electroplating for engineering purposes, such as copper electroplating that acts as a barrier on the surface of heat-treated parts; copper electroplating that acts as a grinding agent in the process of wire drawing; copper electroplating that acts as the base layer of tin plating to prevent the diffusion of base metal, etc. This standard does not apply to copper electroplating and copper base layers for decorative purposes and copper plating for electroforming. 2 Reference standards
GB1238 Method for indicating gold plating and chemical treatment GB2423.28 Basic environmental test procedures for electric products Test T: Soldering test method: (i1935 Determination of thickness of metal coating GB 49$6
GR527U
(i135931
GB 6162
0B6463
GB12609
Measurement of thickness of non-magnetic coatings on magnetic metal substrates Magnetic method Test method for thickness of metal coatings (electrodeposited coatings and chemically deposited coatings) under metal substrates Test method for thickness of metal coatings and chemically treated layers on light industrial products X-ray backscattering Microscopic measurement method for thickness of metal and oxide coatings Thickness measurement method of metal and other inorganic coatings Review of relevant finishing methods of electrodeposited metal coatings Count sampling inspection GB12334
Definitions and general rules for thickness measurement of metal and other inorganic coatings 3 Terminology
3.1. Surface
Articles 1 Certain electroplated Or the surface to be electroplated. The coating on this surface is important to the appearance and (or) performance of the product: 3.2 Minimum rear thickness
The minimum value of the local thickness measured on the main surface 1 of a product, also known as the minimum thickness. 4 Method of indicating the coating
For the indication of the copper plating layer and related treatments, see B1238.5 Base metal
This standard does not specify the surface state of the base metal before electroplating, and the two parties should negotiate on it. 6 Information that the purchaser should provide to the supplier
6.1 Necessary information
Approved by the State Bureau of Technical Supervision on April 27, 1990 and implemented on December 1, 1990
The standard number of this standard is (B12333; GB 1233390
Minimum thickness requirements for copper electroplating (see Chapter 7): Main surfaces, which should be marked on the order or drawing, or with appropriately marked samples: Sampling plan (see Chapter 11);
Number of specimens for destructive testing:
Whether porosity testing is to be carried out, if necessary, the porosity requirements should be stated; Whether solderability testing is to be carried out, if necessary, the relevant details should be stated (see 13.2); Whether hydrogen embrittlement testing is to be carried out , if necessary, the test method and requirements shall be stated; the thickness of the copper plating is any tolerance requirement, if there is a requirement, the tolerance value shall be stated. 6.2 Additional information
When necessary, the purchaser shall also provide the following information: base material brand;
maximum tensile strength or hardness of the part;
whether stress relief heat treatment has been done or is required; whether heat treatment to eliminate hydrogen embrittlement is required;
packaging, storage or transportation requirements of copper-plated parts. 6.3 When necessary, a test specimen shall be provided to replace the product for testing, i.e., "substitute test specimen" (see Chapter 12). Thickness series
Thickness series of molybdenum electroplating layer, i.e., minimum thickness requirements and application examples are listed in Cloth 1, Table 1 Thickness series of copper electroplating layer
Required minimum high part thickness
Specified as needed
8 Heat treatment of steel parts before electroplating to relieve stress
Heat treatment barrier layer
Application examples
Permeation Carbon and decarburized positive expansion layer: printed circuit board through-hole plating; engineering drawing wire copper plating
Electrical. Electrical parts plating; threaded parts and other parts tightness requirements copper-tin coating bottom layer · Yin stop base metal from diffusing into the tin layer Similar uses or other uses mentioned above
8.1 The party stipulates that the steel parts should be subjected to stress relief heat treatment before plating, generally according to the provisions of Table 2. Table 2 Stress relief heat treatment of steel parts before electroplating stipulates the maximum tensile strength value of the target,
Rm=.1 050
1 050-R1 150
14501 H0
Rn1 800
Temperature,
190- 220
190--220C
190--220C
Heat treatment
At least 1h
At least 18
At least h
8.2 Heat treatment can also be carried out under different conditions in Table 2, such as appropriately increasing the temperature and shortening the time, but it should be agreed upon by both the supplier and the buyer, GB 12333-90
8.3 For parts that have been annealed, stress relief should be treated at 130~150 for at least 5 h. If the hardness of the substrate surface is allowed to decrease, it can also be treated at a higher temperature for a shorter time. 9 Requirements for coating
9.1 Appearance
On the main surface, the coating should be smooth and flat, without obvious defects such as pooling, pitting, roughness, cracks, peeling, burning and full plating. The boundary of the local electroplating layer (such as anti-carburizing copper plating) should be free of burrs, nodules or other harmful irregular edges. The allowable coating defects and their extent on non-main surfaces should be specified by the purchaser, and the inevitable traces and their positions on the main surface should also be specified by the purchaser. If necessary, the supplier may propose modification opinions, but they shall be approved by the purchaser. 9.2 Density
The minimum thickness of the copper layer on the main surface shall comply with the provisions of 1 or the requirements of the purchaser. When there is a dimensional tolerance requirement, it shall also meet the tolerance value specified by the purchaser (see 6.1). Note: When copper plating on screw parts, it is necessary to avoid plating too thick on the top of the screw thread. In order to make the coating thickness on the tooth tip not exceed the maximum thickness allowed, the coating thickness on other surfaces can be allowed to be slightly smaller than the specified value. 9.3 Bonding strength
The coating and the body shall be well bonded. The bonding strength test shall be carried out in accordance with one of the methods specified in GB 5270 for copper plating. After the test, there shall be no separation between the coating and the substrate. 9.4 Porosity
When the purchaser specifies the requirements for the porosity of the coating, the porosity test can be carried out according to the method specified in Appendix A (Test Materials) or other standard methods specified by the purchaser. The test results should meet the requirements specified by the purchaser. 9.5 Solderability
When the purchaser specifies the requirements for the solderability of the coating, the solderability test should be carried out according to one of the methods specified in GB2423.28 or other standard methods specified by the purchaser. The test results should meet the requirements specified in 4.6.4 (solder tank test) or 1.7.1 (soldering iron test) or 4.8.1 (solder ball test) of GB2423.28 or other methods specified by the purchaser. The purchaser should also explain some of the test details. For details, see 13. 2,
9.6 Hydrogen embrittlement
When the purchaser specifies that certain structural steel or high-strength steel parts need to be subjected to hydrogen embrittlement tests after electroplating: hydrogen embrittlement tests can be carried out according to the methods specified in Appendix B (reference) or other standard methods specified by the purchaser. The test results should meet the requirements specified in each method. Heat treatment to eliminate hydrogen embrittlement after electroplating of steel
10.1 If the purchaser specifies that steel parts after electroplating need to be subjected to heat treatment to eliminate hydrogen embrittlement, the requirements of Table 3 should be followed. Table 3 Maximum tensile strength R of steel parts after electroplating to eliminate hydrogen embrittlement:
R_1 ho
1 050-.1 450
1 450-#m1 800
10.2 Heat treatment should be carried out as soon as possible within 4 hours after electroplating: 10.3 Heat treatment temperature cannot exceed the tempering temperature of the component: temperature,
190~-220℃
190--220
190--220 C:
Heat treatment
time, h
at least 8h
to 18h
at least 24h
10.4 Surface annealed parts. When eliminating hydrogen embrittlement, they should be heated at 130-15℃: for at least 2h. If the hardness of the substrate surface is allowed to decrease, it can also be treated at a higher temperature.
GB 123339
10.5 Electroplated sieve parts or other parts that need to be bent should not be bent before eliminating hydrogen. 11 Sampling
In order to check whether the copper coating meets the requirements of Chapter 9 of this standard, sampling should be carried out in accordance with the relevant provisions of GB1260.9. 12 Substitution of samples
12.1 When the size and shape of the plated parts are not suitable for certain tests specified in this standard, or destructive tests will significantly reduce the number of small batches of electroplated products, the purchaser should indicate whether to use substitution samples for certain destructive tests specified in this standard. When substituting samples, the plated parts they represent should be exactly the same or very close, including the composition, content, state of their base metal materials, surface roughness before electroplating, and electroplating process, and even the relative position and distance with the anode and other plated parts in the electroplating tank should be consistent with the plated parts, and pre-plating preparation, electroplating and post-plating treatment should be carried out at the same time as the plated parts they represent. 12.2 Unless otherwise stated by the purchaser, substitute specimens shall not be used when conducting non-destructive tests and traceability inspections at the production site. 13 Test methods
13.1 Thickness
The thickness of the copper plating layer can be measured by the methods in GB1955, GB4956, GB593I, and GB6462 according to the different conditions of the parts, or other methods suitable for copper plating specified in GB6463 can be selected, but the measurement error must be within 10%. For regulations on the measurement of plating thickness, see GB12334. 13.2 Solderability
When the solderability test of the coating is carried out in accordance with the provisions of GB32123.28, the purchaser shall specify the following test details: a: Whether to conduct accelerated aging test,
h: Method of aging test (see GB2423.28): c. Type of solderability test method, i.e. solder bath method, soldering iron method or solder ball method, solder bath method commonly used for general copper-plated parts, GB 12333--90
Appendix A
Test Method for Porosity
【Test Material】
The method specified in the appendix can measure the pores in the copper electroplated layer on the steel substrate that reach the substrate. A1 Filter Paper Method
A1.1 This method is applicable to parts with a surface area that allows a filter paper to be attached. A1. 2 Test Solution
Use distilled water to prepare a solution containing the following components: Potassium ferric chloride: KFe(CN))
Sodium chloride (NaCl)
Reagent type: chemically pure
41. 3 Test Procedure
The test environment should be kept clean to avoid iron dust in the air. Use ethyl alcohol or other appropriate degreasing agent to thoroughly remove the oil stains on the surface to be tested, rinse with distilled water and dry. It is not necessary to degrease the parts just out of the plating tank.
Put a filter paper strip with a certain mixed strength into the A1.2 solution, and then stick it tightly on the surface to be tested. No gap is allowed between the filter paper and the test surface. Keep it for 20 minutes. The filter paper should be kept moist during the test. Take off the filter paper and observe the surface in contact with the coating. If there are pores in the coating that reach the substrate, a blue mark will appear. A1. 4 Calculation of porosity
Place a plexiglass plate engraved with a force grid (size 1cm\) on the test filter paper printed with pore marks: record the test area and the number of pores, calculate the porosity (number per square centimeter), and if necessary, measure and record the size, number and unit area of ​​the largest pore (such as the maximum number of pores in 1m or a specified area. And explain it in the test report. A2 Immersion method
42.1 The force method is applicable to parts of any size and shape. 42.2 Test solution
Use distilled water to prepare a solution containing the following ingredients: iron rivet (K, (Fe(CN))
Sodium chloride (NacI)
Self-gelatin
Reagent level: chemically pure
A2.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, then immerse them in A2.2 solution, take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu140kαf/m\) or less are suitable for a certain coating process. It can also make a preliminary identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the middle of the coating process.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the product, the material and heat treatment of the test specimen shall be 1. The process is the same as the product machine. B2.2 The shape and size of the specimen
The shape and size of the specimen for delayed destruction: H should be as shown in the table! Regulations:
B2.3 The concentration coefficient should be small
The specimen before the field. 12.h, 1
This method stipulates that the stress concentration coefficient A at the root of the notch of the specimen is equal to 4: K, and the value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing, heat treatment is performed to the required tensile strength of the material, and then fine processing is performed to the specified size. The defect is cut with a soft fine-grained lead oxide grinding wheel. The cutting amount should not be too large. The coolant should be sufficient. The specimen training tool feed is 0.02~0.01mm at the beginning, and 0.00 yuan mm during fine processing. The grinding piece should ensure that the radius of the root of the notch is smooth and projected to ensure that the notch size meets the requirements of the diagram. Measure the root diameter of the notch one by one (4.5-0.05mm in the diagram) and record it for transmission.
12.4.2 In order to ensure the degree of concentricity, the threads at both ends of the specimen should be heat treated and then fine-machined to the required size. B2.5 Stress relief before plating
GB 1233390
The specimen should be heat treated before plating in accordance with the requirements of Chapter 8 of this standard to eliminate grinding stress. The highest temperature during stress relief should be 10~20 degrees lower than the annealing temperature of the test material. At the same time, avoid the tempering brittle zone of the material to ensure that the hardness of the specimen remains unchanged after stress removal. B2.6 Electroplating
The specimen should be treated before plating, electroplated and after plating according to the requirements of the replacement specimen. The thickness of the coating at the V-shaped notch is 12 to 18 μm. The coating should meet the quality requirements specified in Chapter 9 of this standard. The coating should be completed in one go, and repeated electroplating is not allowed. After electroplating, the sample should be heat treated as soon as possible within 3 hours to eliminate hydrogen embrittlement as specified in Chapter 10 of this standard. B3 Delayed failure test
B3. The force error of the endurance testing machine used for delayed failure test should be less than 1%. The eccentricity is less than 15%. B.2 The load borne by the sample during the delayed failure test is equal to the cross-sectional area of ​​the notch of the uncoated sample multiplied by 75% of the tensile strength of the notch sample. When the fracture is recorded after loading, the notch tensile strength of the uncoated sample should be the average value of 3 to 5 uncoated samples: If the notch tensile strength values ​​of the 5 samples are too different, another 3-5 samples should be taken. The sample is retested. B4 Evaluation of test results
B4.7 When evaluating the hydrogen embrittlement of the coating process, six parallel samples are used for delayed failure test: When evaluating the oxygen embrittlement of the product, a diode is used. If it does not break for 200 hours under a certain static load (see B3.2), the process or product is considered to be qualified for hydrogen embrittlement. If a sample breaks for less than 200 hours, it is considered to be unqualified for oxygen embrittlement.
B42 When analyzing the cause of the break, the hydrogen content of the material and the influence of the process such as heat treatment, etc., which increases the oxygen content, should be considered. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. The standard is under the jurisdiction of the Technical Committee for Standardization of Metallic and Non-metallic Coatings. The Wuhan Institute of Materials Protection of the Ministry of Machinery and Electronics Industry is responsible for drafting this standard. The main drafters of this standard are Tao Weizheng and Xie Ruibing.1 When the size and shape of the plated parts are not suitable for certain tests specified in this standard, or destructive tests will significantly reduce the number of small batches of electroplated products, the purchaser should indicate whether to use alternative samples to carry out certain destructive tests specified in this standard. When the alternative samples are used, the plated parts they represent should be completely identical or very close, including the composition, content, state of their base metal materials, surface roughness before electroplating, and electroplating process, and even the relative position and distance with the anode and other plated parts in the electroplating tank should be consistent with the plated parts, and the pre-plating preparation, electroplating and post-plating treatment should be carried out at the same time as the plated parts they represent. 12.2 Unless otherwise stated by the purchaser, substitute specimens shall not be used when conducting non-destructive tests and traceability inspections at the production site. 13 Test methods
13.1 Thickness
The thickness of the copper plating layer can be measured by the methods in GB1955, GB4956, GB593I, and GB6462 according to the different conditions of the parts, or other methods suitable for copper plating specified in GB6463 can be selected, but the measurement error must be within 10%. For regulations on the measurement of plating thickness, see GB12334. 13.2 Solderability
When the solderability test of the coating is carried out in accordance with the provisions of GB32123.28, the purchaser shall specify the following test details: a: Whether to conduct accelerated aging test,
h: Method of aging test (see GB2423.28): c. Type of solderability test method, i.e. solder bath method, soldering iron method or solder ball method, solder bath method commonly used for general copper-plated parts, GB 12333--90
Appendix A
Test Method for Porosity
【Test Material】
The method specified in the appendix can measure the pores in the copper electroplated layer on the steel substrate that reach the substrate. A1 Filter Paper Method
A1.1 This method is applicable to parts with a surface area that allows a filter paper to be attached. A1. 2 Test Solution
Use distilled water to prepare a solution containing the following components: Potassium ferric chloride: KFe(CN))
Sodium chloride (NaCl)
Reagent type: chemically pure
41. 3 Test Procedure
The test environment should be kept clean to avoid iron dust in the air. Use ethyl alcohol or other appropriate degreasing agent to thoroughly remove the oil stains on the surface to be tested, rinse with distilled water and dry. It is not necessary to degrease the parts just out of the plating tank.
Put a filter paper strip with a certain mixed strength into the A1.2 solution, and then stick it tightly on the surface to be tested. No gap is allowed between the filter paper and the test surface. Keep it for 20 minutes. The filter paper should be kept moist during the test. Take off the filter paper and observe the surface in contact with the coating. If there are pores in the coating that reach the substrate, a blue mark will appear. A1. 4 Calculation of porosity
Place a plexiglass plate engraved with a force grid (size 1cm\) on the test filter paper printed with pore marks: record the test area and the number of pores, calculate the porosity (number per square centimeter), and if necessary, measure and record the size, number and unit area of ​​the largest pore (such as the maximum number of pores in 1m or a specified area. And explain it in the test report. A2 Immersion method
42.1 The force method is applicable to parts of any size and shape. 42.2 Test solution
Use distilled water to prepare a solution containing the following ingredients: iron rivet (K, (Fe(CN))
Sodium chloride (NacI)
Self-gelatin
Reagent level: chemically pure
A2.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, then immerse them in A2.2 solution, take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu140kαf/m\) or less are suitable for a certain coating process. It can also make a preliminary identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the middle of the coating process.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the product, the material and heat treatment of the test specimen shall be 1. The process is the same as the product machine. B2.2 The shape and size of the specimen
The shape and size of the specimen for delayed destruction: H should be as shown in the table! Regulations:
B2.3 The concentration coefficient should be small
The specimen before the field. 12.h, 1
This method stipulates that the stress concentration coefficient A at the root of the notch of the specimen is equal to 4: K, and the value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing, heat treatment is performed to the required tensile strength of the material, and then fine processing is performed to the specified size. The defect is cut with a soft fine-grained lead oxide grinding wheel. The cutting amount should not be too large. The coolant should be sufficient. The specimen training tool feed is 0.02~0.01mm at the beginning, and 0.00 yuan mm during fine processing. The grinding piece should ensure that the radius of the root of the notch is smooth and projected to ensure that the notch size meets the requirements of the diagram. Measure the root diameter of the notch one by one (4.5-0.05mm in the diagram) and record it for transmission.
12.4.2 In order to ensure the degree of concentricity, the threads at both ends of the specimen should be heat treated and then fine-machined to the required size. B2.5 Stress relief before plating
GB 1233390
The specimen should be heat treated before plating in accordance with the requirements of Chapter 8 of this standard to eliminate grinding stress. The highest temperature during stress relief should be 10~20 degrees lower than the annealing temperature of the test material. At the same time, avoid the tempering brittle zone of the material to ensure that the hardness of the specimen remains unchanged after stress removal. B2.6 Electroplating
The specimen should be treated before plating, electroplated and after plating according to the requirements of the replacement specimen. The thickness of the coating at the V-shaped notch is 12 to 18 μm. The coating should meet the quality requirements specified in Chapter 9 of this standard. The coating should be completed in one go, and repeated electroplating is not allowed. After electroplating, the sample should be heat treated as soon as possible within 3 hours to eliminate hydrogen embrittlement as specified in Chapter 10 of this standard. B3 Delayed failure test
B3. The force error of the endurance testing machine used for delayed failure test should be less than 1%. The eccentricity is less than 15%. B.2 The load borne by the sample during the delayed failure test is equal to the cross-sectional area of ​​the notch of the uncoated sample multiplied by 75% of the tensile strength of the notch sample. When the fracture is recorded after loading, the notch tensile strength of the uncoated sample should be the average value of 3 to 5 uncoated samples: If the notch tensile strength values ​​of the 5 samples are too different, another 3-5 samples should be taken. The sample is retested. B4 Evaluation of test results
B4.7 When evaluating the hydrogen embrittlement of the coating process, six parallel samples are used for delayed failure test: When evaluating the oxygen embrittlement of the product, a diode is used. If it does not break for 200 hours under a certain static load (see B3.2), the process or product is considered to be qualified for hydrogen embrittlement. If a sample breaks for less than 200 hours, it is considered to be unqualified for oxygen embrittlement.
B42 When analyzing the cause of the break, the hydrogen content of the material and the influence of the process such as heat treatment, etc., which increases the oxygen content, should be considered. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. The standard is under the jurisdiction of the Technical Committee for Standardization of Metallic and Non-metallic Coatings. The Wuhan Institute of Materials Protection of the Ministry of Machinery and Electronics Industry is responsible for drafting this standard. The main drafters of this standard are Tao Weizheng and Xie Ruibing.1 When the size and shape of the plated parts are not suitable for certain tests specified in this standard, or destructive tests will significantly reduce the number of small batches of electroplated products, the purchaser should indicate whether to use alternative samples to carry out certain destructive tests specified in this standard. When the alternative samples are used, the plated parts they represent should be completely identical or very close, including the composition, content, state of their base metal materials, surface roughness before electroplating, and electroplating process, and even the relative position and distance with the anode and other plated parts in the electroplating tank should be consistent with the plated parts, and the pre-plating preparation, electroplating and post-plating treatment should be carried out at the same time as the plated parts they represent. 12.2 Unless otherwise stated by the purchaser, substitute specimens shall not be used when conducting non-destructive tests and traceability inspections at the production site. 13 Test methods
13.1 Thickness
The thickness of the copper plating layer can be measured by the methods in GB1955, GB4956, GB593I, and GB6462 according to the different conditions of the parts, or other methods suitable for copper plating specified in GB6463 can be selected, but the measurement error must be within 10%. For regulations on the measurement of plating thickness, see GB12334. 13.2 Solderability
When the solderability test of the coating is carried out in accordance with the provisions of GB32123.28, the purchaser shall specify the following test details: a: Whether to conduct accelerated aging test,
h: Method of aging test (see GB2423.28): c. Type of solderability test method, i.e. solder bath method, soldering iron method or solder ball method, solder bath method commonly used for general copper-plated parts, GB 12333--90
Appendix A
Test Method for Porosity
【Test Material】
The method specified in the appendix can measure the pores in the copper electroplated layer on the steel substrate that reach the substrate. A1 Filter Paper Method
A1.1 This method is applicable to parts with a surface area that allows a filter paper to be attached. A1. 2 Test Solution
Use distilled water to prepare a solution containing the following components: Potassium ferric chloride: KFe(CN))
Sodium chloride (NaCl)
Reagent type: chemically pure
41. 3 Test Procedure
The test environment should be kept clean to avoid iron dust in the air. Use ethyl alcohol or other appropriate degreasing agent to thoroughly remove the oil stains on the surface to be tested, rinse with distilled water and dry. It is not necessary to degrease the parts just out of the plating tank.
Put a filter paper strip with a certain mixed strength into the A1.2 solution, and then stick it tightly on the surface to be tested. No gap is allowed between the filter paper and the test surface. Keep it for 20 minutes. The filter paper should be kept moist during the test. Take off the filter paper and observe the surface in contact with the coating. If there are pores in the coating that reach the substrate, a blue mark will appear. A1. 4 Calculation of porosity
Place a plexiglass plate engraved with a force grid (size 1cm\) on the test filter paper printed with pore marks: record the test area and the number of pores, calculate the porosity (number per square centimeter), and if necessary, measure and record the size, number and unit area of ​​the largest pore (such as the maximum number of pores in 1m or a specified area. And explain it in the test report. A2 Immersion method
42.1 The force method is applicable to parts of any size and shape. 42.2 Test solution
Use distilled water to prepare a solution containing the following ingredients: iron rivet (K, (Fe(CN))
Sodium chloride (NacI)
Self-gelatin
Reagent level: chemically pure
A2.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, then immerse them in A2.2 solution, take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu140kαf/m\) or less are suitable for a certain coating process. It can also make a preliminary identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the middle of the coating process.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the product, the material and heat treatment of the test specimen shall be 1. The process is the same as the product machine. B2.2 The shape and size of the specimen
The shape and size of the specimen for delayed destruction: H should be as shown in the table! Regulations:
B2.3 The concentration coefficient should be small
The specimen before the field. 12.h, 1
This method stipulates that the stress concentration coefficient A at the root of the notch of the specimen is equal to 4: K, and the value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing, heat treatment is performed to the required tensile strength of the material, and then fine processing is performed to the specified size. The defect is cut with a soft fine-grained lead oxide grinding wheel. The cutting amount should not be too large. The coolant should be sufficient. The specimen training tool feed is 0.02~0.01mm at the beginning, and 0.00 yuan mm during fine processing. The grinding piece should ensure that the radius of the root of the notch is smooth and projected to ensure that the notch size meets the requirements of the diagram. Measure the root diameter of the notch one by one (4.5-0.05mm in the diagram) and record it for transmission.
12.4.2 In order to ensure the degree of concentricity, the threads at both ends of the specimen should be heat treated and then fine-machined to the required size. B2.5 Stress relief before plating
GB 1233390
The specimen should be heat treated before plating in accordance with the requirements of Chapter 8 of this standard to eliminate grinding stress. The highest temperature during stress relief should be 10~20 degrees lower than the annealing temperature of the test material. At the same time, avoid the tempering brittle zone of the material to ensure that the hardness of the specimen remains unchanged after stress removal. B2.6 Electroplating
The specimen should be treated before plating, electroplated and after plating according to the requirements of the replacement specimen. The thickness of the coating at the V-shaped notch is 12 to 18 μm. The coating should meet the quality requirements specified in Chapter 9 of this standard. The coating should be completed in one go, and repeated electroplating is not allowed. After electroplating, the sample should be heat treated as soon as possible within 3 hours to eliminate hydrogen embrittlement as specified in Chapter 10 of this standard. B3 Delayed failure test
B3. The force error of the endurance testing machine used for delayed failure test should be less than 1%. The eccentricity is less than 15%. B.2 The load borne by the sample during the delayed failure test is equal to the cross-sectional area of ​​the notch of the uncoated sample multiplied by 75% of the tensile strength of the notch sample. When the fracture is recorded after loading, the notch tensile strength of the uncoated sample should be the average value of 3 to 5 uncoated samples: If the notch tensile strength values ​​of the 5 samples are too different, another 3-5 samples should be taken. The sample is retested. B4 Evaluation of test results
B4.7 When evaluating the hydrogen embrittlement of the coating process, six parallel samples are used for delayed failure test: When evaluating the oxygen embrittlement of the product, a diode is used. If it does not break for 200 hours under a certain static load (see B3.2), the process or product is considered to be qualified for hydrogen embrittlement. If a sample breaks for less than 200 hours, it is considered to be unqualified for oxygen embrittlement.
B42 When analyzing the cause of the break, the hydrogen content of the material and the influence of the process such as heat treatment, etc., which increases the oxygen content, should be considered. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. The standard is under the jurisdiction of the Technical Committee for Standardization of Metallic and Non-metallic Coatings. The Wuhan Institute of Materials Protection of the Ministry of Machinery and Electronics Industry is responsible for drafting this standard. The main drafters of this standard are Tao Weizheng and Xie Ruibing.When conducting the solderability test of the coating according to the provisions of GB 28, the purchaser shall specify the following test details: a: whether to conduct accelerated aging test,
h aging test method (see GB2423.28): c. type of solderability test method, i.e. solder bath method, soldering iron method or solder ball method, solder bath method commonly used for general copper-plated parts, GB 12333--90
Appendix A
Test method for porosity
【Examination material）
The method specified in the appendix can measure the pores in the copper electroplated layer on the steel substrate that reach the substrate. A1 Filter paper method
A1.1 This method is applicable to parts with a surface area that allows a filter paper to be attached. A1.2 Test solution
Use distilled water to prepare a solution containing the following components: Potassium ferric chloride: KFe(CN)
Sodium chloride (NaCl)
Reagent type: Chemically pure
41.3 Test steps
The test environment should be kept clean to avoid iron dust in the air. Use ethyl alcohol or other appropriate degreasing agent to thoroughly remove the oil stains on the surface to be tested, wash with distilled water and dry. The parts just out of the plating tank do not need to be degreased. www.bzxz.net
Put a filter paper strip with a certain mixing strength into the A1.2 solution, and then stick it tightly on the surface to be tested. No gap is allowed between the filter paper and the test surface. Keep it for 20 minutes. The filter paper should be kept moist during the test. Take off the filter paper and observe the surface in contact with the coating. If there are pores in the coating that reach the substrate, a blue mark will appear. A1. 4 Calculation of porosity
Place a plexiglass plate engraved with a force grid (size 1cm\) on the test filter paper printed with pore marks: record the test area and the number of pores, calculate the porosity (number per square centimeter), and if necessary, measure and record the size, number and unit area of ​​the largest pore (such as the maximum number of pores in 1m or a specified area. And explain it in the test report. A2 Immersion method
42.1 The force method is applicable to parts of any size and shape. 42.2 Test solution
Use distilled water to prepare a solution containing the following ingredients: iron rivet (K, (Fe(CN))
Sodium chloride (NacI)
Self-gelatin
Reagent level: chemically pure
A2.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, then immerse them in A2.2 solution, take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu140kαf/m\) or less are suitable for a certain coating process. It can also make a preliminary identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the middle of the coating process.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the product, the material and heat treatment of the test specimen shall be 1. The process is the same as the product machine. B2.2 The shape and size of the specimen
The shape and size of the specimen for delayed destruction: H should be as shown in the table! Regulations:
B2.3 The concentration coefficient should be small
The specimen before the field. 12.h, 1
This method stipulates that the stress concentration coefficient A at the root of the notch of the specimen is equal to 4: K, and the value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing, heat treatment is performed to the required tensile strength of the material, and then fine processing is performed to the specified size. The defect is cut with a soft fine-grained lead oxide grinding wheel. The cutting amount should not be too large. The coolant should be sufficient. The specimen training tool feed is 0.02~0.01mm at the beginning, and 0.00 yuan mm during fine processing. The grinding piece should ensure that the radius of the root of the notch is smooth and projected to ensure that the notch size meets the requirements of the diagram. Measure the root diameter of the notch one by one (4.5-0.05mm in the diagram) and record it for transmission.
12.4.2 In order to ensure the degree of concentricity, the threads at both ends of the specimen should be heat treated and then fine-machined to the required size. B2.5 Stress relief before plating
GB 1233390
The specimen should be heat treated before plating in accordance with the requirements of Chapter 8 of this standard to eliminate grinding stress. The highest temperature during stress relief should be 10~20 degrees lower than the annealing temperature of the test material. At the same time, avoid the tempering brittle zone of the material to ensure that the hardness of the specimen remains unchanged after stress removal. B2.6 Electroplating
The specimen should be treated before plating, electroplated and after plating according to the requirements of the replacement specimen. The thickness of the coating at the V-shaped notch is 12 to 18 μm. The coating should meet the quality requirements specified in Chapter 9 of this standard. The coating should be completed in one go, and repeated electroplating is not allowed. After electroplating, the sample should be heat treated as soon as possible within 3 hours to eliminate hydrogen embrittlement as specified in Chapter 10 of this standard. B3 Delayed failure test
B3. The force error of the endurance testing machine used for delayed failure test should be less than 1%. The eccentricity is less than 15%. B.2 The load borne by the sample during the delayed failure test is equal to the cross-sectional area of ​​the notch of the uncoated sample multiplied by 75% of the tensile strength of the notch sample. When the fracture is recorded after loading, the notch tensile strength of the uncoated sample should be the average value of 3 to 5 uncoated samples: If the notch tensile strength values ​​of the 5 samples are too different, another 3-5 samples should be taken. The sample is retested. B4 Evaluation of test results
B4.7 When evaluating the hydrogen embrittlement of the coating process, six parallel samples are used for delayed failure test: When evaluating the oxygen embrittlement of the product, a diode is used. If it does not break for 200 hours under a certain static load (see B3.2), the process or product is considered to be qualified for hydrogen embrittlement. If a sample breaks for less than 200 hours, it is considered to be unqualified for oxygen embrittlement.
B42 When analyzing the cause of the break, the hydrogen content of the material and the influence of the process such as heat treatment, etc., which increases the oxygen content, should be considered. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. The standard is under the jurisdiction of the Technical Committee for Standardization of Metallic and Non-metallic Coatings. The Wuhan Institute of Materials Protection of the Ministry of Machinery and Electronics Industry is responsible for drafting this standard. The main drafters of this standard are Tao Weizheng and Xie Ruibing.When conducting the solderability test of the coating according to the provisions of GB 28, the purchaser shall specify the following test details: a: whether to conduct accelerated aging test,
h aging test method (see GB2423.28): c. type of solderability test method, i.e. solder bath method, soldering iron method or solder ball method, solder bath method commonly used for general copper-plated parts, GB 12333--90
Appendix A
Test method for porosity
【Examination material）
The method specified in the appendix can measure the pores in the copper electroplated layer on the steel substrate that reach the substrate. A1 Filter paper method
A1.1 This method is applicable to parts with a surface area that allows a filter paper to be attached. A1.2 Test solution
Use distilled water to prepare a solution containing the following components: Potassium ferric chloride: KFe(CN)
Sodium chloride (NaCl)
Reagent type: Chemically pure
41.3 Test steps
The test environment should be kept clean to avoid iron dust in the air. Use ethyl alcohol or other appropriate degreasing agent to thoroughly remove the oil stains on the surface to be tested, wash with distilled water and dry. The parts just out of the plating tank do not need to be degreased.
Put a filter paper strip with a certain mixing strength into the A1.2 solution, and then stick it tightly on the surface to be tested. No gap is allowed between the filter paper and the test surface. Keep it for 20 minutes. The filter paper should be kept moist during the test. Take off the filter paper and observe the surface in contact with the coating. If there are pores in the coating that reach the substrate, a blue mark will appear. A1. 4 Calculation of porosity
Place a plexiglass plate engraved with a force grid (size 1cm\) on the test filter paper printed with pore marks: record the test area and the number of pores, calculate the porosity (number per square centimeter), and if necessary, measure and record the size, number and unit area of ​​the largest pore (such as the maximum number of pores in 1m or a specified area. And explain it in the test report. A2 Immersion method
42.1 The force method is applicable to parts of any size and shape. 42.2 Test solution
Use distilled water to prepare a solution containing the following ingredients: iron rivet (K, (Fe(CN))
Sodium chloride (NacI)
Self-gelatin
Reagent level: chemically pure
A2.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, then immerse them in A2.2 solution, take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu140kαf/m\) or less are suitable for a certain coating process. It can also make a preliminary identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the middle of the coating process.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the product, the material and heat treatment of the test specimen shall be 1. The process is the same as the product machine. B2.2 The shape and size of the specimen
The shape and size of the specimen for delayed destruction: H should be as shown in the table! Regulations:
B2.3 The concentration coefficient should be small
The specimen before the field. 12.h, 1
This method stipulates that the stress concentration coefficient A at the root of the notch of the specimen is equal to 4: K, and the value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing, heat treatment is performed to the required tensile strength of the material, and then fine processing is performed to the specified size. The defect is cut with a soft fine-grained lead oxide grinding wheel. The cutting amount should not be too large. The coolant should be sufficient. The specimen training tool feed is 0.02~0.01mm at the beginning, and 0.00 yuan mm during fine processing. The grinding piece should ensure that the radius of the root of the notch is smooth and projected to ensure that the notch size meets the requirements of the diagram. Measure the root diameter of the notch one by one (4.5-0.05mm in the diagram) and record it for transmission.
12.4.2 In order to ensure the degree of concentricity, the threads at both ends of the specimen should be heat treated and then fine-machined to the required size. B2.5 Stress relief before plating
GB 1233390
The specimen should be heat treated before plating in accordance with the requirements of Chapter 8 of this standard to eliminate grinding stress. The highest temperature during stress relief should be 10~20 degrees lower than the annealing temperature of the test material. At the same time, avoid the tempering brittle zone of the material to ensure that the hardness of the specimen remains unchanged after stress removal. B2.6 Electroplating
The specimen should be treated before plating, electroplated and after plating according to the requirements of the replacement specimen. The thickness of the coating at the V-shaped notch is 12 to 18 μm. The coating should meet the quality requirements specified in Chapter 9 of this standard. The coating should be completed in one go, and repeated electroplating is not allowed. After electroplating, the sample should be heat treated as soon as possible within 3 hours to eliminate hydrogen embrittlement as specified in Chapter 10 of this standard. B3 Delayed failure test
B3. The force error of the endurance testing machine used for delayed failure test should be less than 1%. The eccentricity is less than 15%. B.2 The load borne by the sample during the delayed failure test is equal to the cross-sectional area of ​​the notch of the uncoated sample multiplied by 75% of the tensile strength of the notch sample. When the fracture is recorded after loading, the notch tensile strength of the uncoated sample should be the average value of 3 to 5 uncoated samples: If the notch tensile strength values ​​of the 5 samples are too different, another 3-5 samples should be taken. The sample is retested. B4 Evaluation of test results
B4.7 When evaluating the hydrogen embrittlement of the coating process, six parallel samples are used for delayed failure test: When evaluating the oxygen embrittlement of the product, a diode is used. If it does not break for 200 hours under a certain static load (see B3.2), the process or product is considered to be qualified for hydrogen embrittlement. If a sample breaks for less than 200 hours, it is considered to be unqualified for oxygen embrittlement.
B42 When analyzing the cause of the break, the hydrogen content of the material and the influence of the process such as heat treatment, etc., which increases the oxygen content, should be considered. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. The standard is under the jurisdiction of the Technical Committee for Standardization of Metallic and Non-metallic Coatings. The Wuhan Institute of Materials Protection of the Ministry of Machinery and Electronics Industry is responsible for drafting this standard. The main drafters of this standard are Tao Weizheng and Xie Ruibing.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, and then immerse them in A2.2 solution. Take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu (140kαf/m\) or less are suitable for a certain coating process. It can also make a specific identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the first half of the period.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the production, the material and heat treatment process of the test specimen shall be the same as the product machine. B2.2 Shape and size of the specimen
The shape and size of the specimen for delayed failure shall be as shown in the table! Regulations:
B2.3 The concentration factor should be small
The specimen before the field test. 12.h, 1
This method stipulates that the stress concentration factor A at the root of the notch of the specimen is equal to 4:K. The value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing, heat treat the material to the required tensile strength, and then fine-process to the specified size. Use soft The amount of cutting by fine-grained lead oxide grinding wheel should not be too large. The coolant should be sufficient. The initial feed of the specimen during training should be 0.02~0.01mm, and 0.00mm during finishing. The grinding disc should ensure that the radius of the root of the notch is smooth and projected to ensure that the notch size meets the requirements of the diagram. Measure the root diameter of the notch one by one (4.5-0.05mm in the diagram) and record it for transmission.
12.4.2 In order to ensure the return to the center, the threads at both ends of the specimen should be heat treated and then fine-machined to the required size. B2.5 Stress relief before plating
GB 1233390
The specimen shall be heat treated before plating in accordance with the requirements of Chapter 8 of this standard to eliminate grinding stress. The highest temperature during stress elimination shall be 10~20℃ lower than the annealing temperature of the test material. At the same time, the tempering brittle zone of the material shall be avoided to ensure that the hardness of the specimen remains unchanged after stress removal. B2.6 Electroplating
The specimen shall be prepared before plating, electroplated and post-plated in accordance with the requirements of the replacement specimen. The thickness of the coating at the V-shaped notch is 12~18Lm. The coating shall meet the quality requirements specified in Chapter 9 of this standard. The coating shall be completed in one go and repeated electroplating is not allowed. After electroplating, the specimen shall be tested for 3 h in accordance with the requirements of Chapter 10 of this standard. Heat treatment to eliminate hydrogen embrittlement should be performed as soon as possible. B3 Delayed failure test || tt || B3. The force error of the endurance tester used for delayed failure test should be less than 1%. The non-concentricity should be less than 15%. B.2 The load on the sample during delayed failure test is equal to the cross-sectional area of ​​the notch of the uncoated sample multiplied by 75% of the tensile strength of the notch sample. After loading, record the fracture. The notch tensile strength of the uncoated sample should be the average value of 3 to 5 uncoated samples: If the notch tensile strength of the 5 samples is too different, another 3-5 samples should be taken. The sample is retested. B4 Evaluation of test results
B4.7 When evaluating the hydrogen embrittlement of the coating process, six parallel samples are used for delayed failure test: When evaluating the oxygen embrittlement of the product, a diode is used. If it does not break for 200 hours under a certain static load (see B3.2), the process or product is considered to be qualified for hydrogen embrittlement. If a sample breaks for less than 200 hours, it is considered to be unqualified for oxygen embrittlement.
B42 When analyzing the cause of the break, the hydrogen content of the material and the influence of the process such as heat treatment, etc., which increases the oxygen content, should be considered. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. The standard is under the jurisdiction of the Technical Committee for Standardization of Metallic and Non-metallic Coatings. The Wuhan Institute of Materials Protection of the Ministry of Machinery and Electronics Industry is responsible for drafting this standard. The main drafters of this standard are Tao Weizheng and Xie Ruibing.3 Test positive medium
10 g/L
Treat the parts to be tested according to the requirements of 1.3, and then immerse them in A2.2 solution. Take them out and observe them after 5 minutes. If there are pores in the coating that reach the substrate, blue spots will appear:
A2.4 Calculation of pore drying rate
Calculate the surface area and number of color spots in the solution, Section II Porosity (number per square centimeter). Or treat them in the same way as A1.1,
GB 12333—90
Appendix B
Hydrogen embrittlement test method
(reference)
This appendix specifies the use of the delayed failure method to identify whether high-strength steel and structural steel and spring steel with a tensile strength of 1372MPu (140kαf/m\) or less are suitable for a certain coating process. It can also make a specific identification of the hydrogen embrittlement of the coating process and the product. B1 Principle of the method
High-strength steel and structural steel absorb hydrogen and apply stress. When subjected to a static load less than the yield strength for a certain period of time, the steel will fracture in the first half of the period.
B2 Test specimen
B2.1 Material of the test specimen
B2.1.1 When identifying the coating process, the test specimen shall be the same as the material of the product and heat treated to the upper limit of the tensile strength: B2.1.2 When setting the production, the material and heat treatment process of the test specimen shall be the same as the product machine. B2.2 Shape and size of the specimen
The shape and size of the specimen for delayed failure shall be as shown in the table! Regulations:
B2.3 The concentration factor should be small
The specimen before the field test. 12.h, 1
This method stipulates that the stress concentration factor A at the root of the notch of the specimen is equal to 4:K. The value is obtained by drawing a graph according to the Neuber formula. B2.4 Preparation of the specimen
(2IxIn
32.4.1 Make the axis of the specimen parallel to the rolled fiber square of the material. Process according to the requirements of the diagram. After rough processing,
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