Some standard content:
GB/T10125-1997
This standard is equivalent to ISO9227:1990 "Artificial atmosphere corrosion test - salt spray test". Taking into account the large changes in the initial test samples and to meet the needs of various domestic products, this standard sets the recommended test cycle as 2h, 4h, 6h.8h, 24h, 48h, 96h, 168h, 240h, 480h, 720h, 1000h; compared with IS09227:1990, 4h and 8h are added.
This standard replaces:
GB6458-86 Metal Covering Neutral Salt Spray Test (NSS Test), GB645986 Metal Covering Acetate Spray Test (ASS Test), GB6460-86 Metal Covering Copper Accelerated Acetate Spray Test (CASS Test), Salt Spray Test (SS Test).
GB10125-88 Corrosion test in artificial atmosphere Annexes A and B of this standard are both informative appendices. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coatings. The responsible drafting unit of this standard is: Wuhan Institute of Materials Protection, Ministry of Machinery Industry. The main drafters of this standard are Zhang Yan, Zhang Sanping and Xiao Yide. 705
GB/T101251997
ISO Foreword
ISO (International Organization for Standardization) is a worldwide union of national standards bodies (IS() member bodies). The work of formulating international standards is generally carried out through ISO technical committees. If each member body is interested in a subject determined by a technical committee, it has the right to make representations to the committee. International organizations, both governmental and non-governmental, in liaison with ISO, may also participate in the work. ISO works closely with the International Electrotechnical Commission (IFC) in all aspects of electrotechnical standardization. The draft international standard prepared by the technical committee is first sent to each member group for voting. According to ISO procedures, at least 75% of the member groups participating in the voting must approve it before it can be published as an international standard. International standard ISO9227 was prepared by ISO/TC156 Technical Committee on Corrosion of Metals and Alloys. It cancels and replaces the international standards: ISO3768-1976 Metal Covering - Neutral Salt Spray Test (NSS Test), ISO3769-1976 Metal Covering - Acetic Acid Spray Test (ASS Test), ISO3770-1976 Metal Covering - Copper Accelerated Acetic Acid Spray Test (CASS Test). Appendix A and Appendix B of this international standard are both prompt appendices. 706
0 Introduction
National Standard of the People's Republic of China
Corrosion tests in artificial atmospheres-Salt spray tests1997
GB/T 10125
eqyIso9227:1990
Replaces GB6458~~646086
GB 10125--88
Since there are many factors that affect metal corrosion, the single salt spray resistance cannot replace the resistance to other media. Therefore, the test results obtained in this standard cannot be used as a direct guide to the corrosion resistance of the tested materials in all use environments. At the same time, the performance of various materials in the test cannot be used as a direct guide to the corrosion resistance of these materials in use. Nevertheless, the method specified in this standard can still be used as a method to test whether the tested materials have or not corrosion protection performance. 1 Scope
This standard specifies the equipment, reagents and methods used in neutral salt spray (NSS), acetic acid salt spray (AASS) and copper accelerated acetic acid salt spray (CASS) tests.
This standard also specifies the method for evaluating the corrosiveness of the test chamber environment. This standard does not specify the specimen size, test cycle and result interpretation of special products. For these contents, please refer to the corresponding product specifications. This standard is applicable to the evaluation of the corrosion resistance of metal materials and coatings. The tested objects can be permanent or temporary corrosion protection or non-permanent or temporary corrosion protection. The neutral salt spray test of this standard is applicable to metals and their alloys, metal coatings, organic coatings, anodic oxide films and conversion films! 。 The acetic acid salt spray test and the copper accelerated acetic acid salt spray test are applicable to copper + nickel + chromium or nickel + chromium decorative coatings, and are also applicable to aluminum anodic oxide films. "
2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB5213-85 Cold-rolled steel sheets and strips for deep drawing GB6461--86 Rating of electroplated specimens after corrosion tests of metal coverings on substrates with cathodes (eqvISO 4540:1980)
Rating of specimens after corrosion tests of metal coverings on substrates with anodic coatings (eqvIS()8403:GB 12335wwW.bzxz.Net
GB/T9798-1997 Metallic coating Nickel electrodeposited layer (eqvISO1458:1988) IS6372-1:1989 Nickel and nickel alloys - Nomenclature, terms and definitions - Part: Materials 1) See Appendix B (suggestive appendix).
2) Note the fact that since the reagents used contain copper ions that promote the corrosion of Ni but do not affect Cu, this test is not an appropriate basis for satisfactory comparison of the corresponding qualities of Ni-Cr coatings and Cu+Ni-Cr coatings. Approved by the National Technical Supervision Bureau on June 27, 1997, and implemented in January 1998
3 Test solution
3.1 Preparation of sodium chloride solution
GB/T10125—1997
The reagents used in this test are chemically pure or higher. Dissolve sodium chloride in spectrophotometric water or deionized water with a conductivity not exceeding 20\S/cm, and the concentration is 50g/L±5g/L. At 25C, the density of the prepared solution is within the range of 1.0255~1.0400. 3.2 Adjust p H
Adjust the salt solution to the specified pH value according to the pH value of the collected spray solution. 3.2.1 Neutral Salt Spray Test (NSS Test) Adjust the pH value of the salt solution prepared according to 3.1 to between 6.5 and 7.2. The pH value can be measured using an acidity meter, and as a normal test, a precision pH test paper with a measuring accuracy of 0.3 can also be used. The pH value of the solution can be adjusted with hydrochloric acid or sodium hydroxide. The loss of carbon dioxide in the solution during spraying may cause the pH value to change. Appropriate measures should be taken, for example, heating the solution to more than 35 (before it is sent into the The instrument or the solution is prepared by new boiling water to reduce the carbon dioxide content in the solution, which can avoid the change of pH value. 3.2.2 Acetic acid salt spray test (AASS test) Add an appropriate amount of glacial acetic acid to the salt solution prepared according to 3.1 to ensure that the pH value of the collected liquid in the salt spray box (see 4.2) is 3.1~~3.3. If the pH value of the initially prepared solution is 3.0~3.1, the pH value of the collected liquid is generally in the range of 3.1~3.3. The pH value is determined by an acidometer, and as a daily test, a precision pH test paper with a measurement accuracy of 0.1 can also be used. The pH value of the solution can be adjusted with glacial acetic acid or sodium hydroxide.
3.2.3 Copper accelerated acetic acid salt spray test (CASS test) Add copper chloride (CuCl·2H20) to the salt solution prepared according to 3.2, and its concentration is 0.26g/L±0.02g/L (i.e. 0.205g/L-0.015g/L anhydrous copper chloride). The method for adjusting the pH value of the solution is the same as 3.2.2. 3.3 Filtration
To avoid clogging the nozzle, the solution must be filtered before use. 4 Test equipment
4.1 The materials used to make the test equipment must be resistant to salt spray corrosion and not affect the test results. 4.2 The volume of the salt spray box shall not be less than 0.2m3, and preferably not less than 0.4m3. The top of the box should avoid the accumulated solution during the test from dripping onto the specimen. The shape and size of the box should be able to ensure that the collection rate of the solution in the box meets the requirements of 8.3. Note 1: The design diagram of the salt spray box is shown in Appendix A (suggestive appendix). 4.3 The heating system should maintain the temperature in the box to the requirements of 8.1. The temperature measurement area is not less than 100mm from the inner wall of the box and can be read from outside the box. 4.4. The spray device includes the following parts:
a) Spray air source: The compressed air should pass through the filter to remove oil and purify; then enter the saturated tower filled with distilled water for humidification, and its temperature should be higher than the test temperature in the salt spray chamber. Finally, it enters the sprayer through the pressure regulating valve, and the pressure should be controlled within the range of 70kPa to 170kPa. b) Spray system: It consists of a sprayer, a salt water tank and a baffle. One or more sprayers can be used. The adjustable baffle can prevent the salt spray from being directly sprayed onto the specimen. The position of the sprayer and the baffle has an impact on the uniform distribution of the salt spray. c) Salt water tank: In order to ensure uniform spraying, there should be a device to maintain a certain liquid level. Adjust the spray pressure, the temperature of the saturated tower water and the position of the baffle so that the salt spray precipitation and collection speed in the box meet the requirements of 8.3. 4.5 Salt spray collector: At least two collectors are placed in the box, one close to the nozzle and one away from the nozzle. The collector is made of inert materials such as glass in the shape of a funnel, with a diameter of 10 cm and a collection area of about 80 cm. The funnel tube is inserted into a container with a scale. It is required to collect salt spray, not liquid dripping from the sample or other parts. 4.6 Before using the solution for testing, the salt spray box must be thoroughly cleaned. Before putting the sample in, the equipment should be run empty for 24 hours. It must be used. Instructions:
Considering that the current chemically pure reagents in my country can meet the requirements of IS) 9227, this standard stipulates that the reagents used can be chemically pure 708
GB/T10125-:1997
Measure the pH value of the collected liquid to ensure that the pH value of the entire spray period is within the specified range. 5 Method for evaluating the corrosion performance of salt spray chamber
To verify the reproducibility of the test results of the test equipment or similar equipment in different laboratories, the equipment should be verified according to the provisions of 5.1 to 5.3. 5.1 Neutral salt spray test (NSS test)
5.1.1 Reference sample
The reference sample is four cold-rolled carbon steel plates, and its surface quality should meet the requirements of I red of grade A accuracy in GB5213. The plate thickness is 1mm±0.2mm, and the sample size is 50mm×50mm . The surface roughness of the sample is R, 1.3μm ± 0.4um. The sample is cut from the cold-rolled steel sheet or strip.
The reference sample is carefully cleaned and immediately put into the test. In addition to the provisions of 6.2 and 6.3, all dust, oil or other foreign matter that may affect the test results should be removed.
Select one of the following cleaning methods:
a) Clean the sample with chlorinated hydrocarbon vapor degreasing, using 3 consecutive treatments of 1 minute, with at least 1 minute interval between each consecutive treatment. min.
b) Use a clean soft brush or ultrasonic cleaning device to thoroughly clean the sample with an appropriate organic solvent (hydrocarbon with a boiling point between 60 and 120°C). After cleaning, rinse the sample with a new solvent and then dry it. c) After consultation with all parties concerned, other cleaning methods may be used. After cleaning, blow dry and weigh the sample to an accuracy of ±1mg, and then protect the back of the sample with a peelable plastic film. 5.1.2 Placement of reference samples
The sample is placed at the four corners of the box, with the unprotected side facing up and perpendicular to the vertical direction. Angle of 20°±5°. The upper edge of the specimen is at the same level as the top of the salt mist collector.
Note 2: It is recommended to use angles within other specification ranges (e.g. 30°±5°). The reference specimen holder is made of or coated with inert material (e.g. plastic). The upper edge of the reference specimen should be at the same level as the upper part of the salt mist collector.
5.1.3 Determination of mass loss
After 96 hours of the test, remove the protective film on the back of the specimen and use a 1:1 (volume ratio) hydrochloric acid solution (pzo=1.18g/mL ), add 3.5g/1 hexamethylenetetramine corrosion inhibitor, soak the sample to remove corrosion products, then wash the sample with water at room temperature, then wash with acetone, dry and weigh.
Weigh the sample to an accuracy of 1mg, and calculate the mass loss (g/m2). 5.1.4 Operation test of neutral salt spray device
The mass loss of each reference sample within the range of 140g/m±40g/m2 indicates that the equipment is operating normally. 5.2 Acetic acid salt spray test (AASS test)
This standard does not test 5.3 Copper accelerated acetic acid salt spray test (CASS test) 5.3.1 Reference sample
Four nickel plates are used as reference samples. The sample meets the requirements of 3.1 of ISO6372-1:1989 (the total amount of nickel and cobalt is not less than 99.0%, of which cobalt is not more than 1.5%, iron is not more than 0.5%, oxygen is not more than 0.4%, and other is not more than 0.3%). Its size is 100mm×75mm, thickness is 1mm±0.2mm, and the sample is cut from the plate. The sample is first cleaned according to the provisions of 6.2, then immersed in a 1:4 (volume ratio) hydrochloric acid solution at 21~24℃ for 2min, then rinsed with hot running water, dried in an oven at a temperature of 105℃, cooled to room temperature and weighed. In the test, the nickel plate can be used repeatedly after being treated by the two methods.
The sample is weighed accurately to 1mg, and the back of the sample is protected with a peelable plastic film. 5.3.2 Reference sample placement
Reference sample placement is the same as 5.1.2.
GB/T 10125..1997
5.3.3 Determination of mass loss (mass per unit area) After 24 hours of the test, rinse the salt deposited on the surface of the nickel plate with cold water, and then soak it in a 1:4 (volume ratio) hydrochloric acid solution at 25°C±2°C for 2 minutes to remove the corrosion products. Rinse it in running water at a temperature of 40°C±5°C, and dry it in an oven at a temperature of 105 (. Then, cool it to room temperature and weigh it. Weigh it to an accuracy of 1 mg. Note 3: The specimen fixture should be made of nickel or monel alloy or other inert materials. 5.3.4 Operation test of copper accelerated acetic acid salt spray device The mass loss of each reference specimen within the range of 7.5g/m2 ± 2.5g/m2 indicates that the test equipment is operating normally. 6 Specimens
6.1 The type, quantity, shape and size of the specimens shall be selected according to the relevant standards of the test materials or products. If there are no standards, the relevant parties shall decide through consultation.
6.2 The specimens must be cleaned before the test (see 5.1.1). The cleaning method depends on the properties of the specimen material. Abrasives or solvents that may corrode the surface of the specimens and their contaminants should not be used to clean the specimen surface. The protective coating intentionally applied on the specimens should not be washed off before the test. 6.3 If the specimen is cut from the workpiece, the covering layer near the cutting area must not be damaged. Unless otherwise specified, the cutting area must be protected with an appropriate covering layer such as paint, paraffin or tape. 7 Specimen placement
7.1 The specimen is placed in the salt spray cabinet with the test surface facing up, allowing the salt spray to settle freely on the test surface. The test surface cannot be directly sprayed with salt spray.
7.2 The specimen should be flat in principle. In the salt spray cabinet, the test surface is 15° to 30° to the vertical direction, and as close to 20° as possible. For irregular specimens (such as the entire workpiece), it should be as close to the above regulations as possible. 7.3 The specimens can be placed on different horizontal planes in the box, but they must not touch the box body or Can touch each other. The distance between the specimens should not affect the free fall of salt spray on the test surface, and the droplets on the specimens shall not fall on other specimens. For new inspections or tests with a total test period of more than 96h, specimen displacement may be allowed.
7.4 The specimen holder is made of glass, plastic and other materials. The material for hanging the specimen cannot be metal, but artificial fiber, cotton fiber or other insulating materials should be used.
8 Test conditions
8.1 The temperature in the salt spray chamber for the neutral salt spray test and the acetic acid salt spray test is 35℃±2C. The temperature in the salt spray chamber for the copper accelerated acetic acid salt spray test is 50℃±2℃. During the test, the temperature fluctuation in the entire salt spray chamber should be as small as possible. 8.2 In the salt spray chamber After the samples have been placed as planned and the salt spray collection speed and conditions are confirmed to be within the specified range, the test can be started. 8.3 The salt spray deposition rate is 1-2 mL/h per 80 cm2 area after 24 hours of spraying; the sodium chloride concentration is 50 g/L. ± 5 g/l.; the pH value range is: 6.5~~7.2 for neutral salt spray test, 3.1~~3.3 for acetic acid salt spray test, and 3.1~3.3 for copper accelerated acetic acid salt spray test.
8.4 The used spray solution shall not be reused.
8.5 The temperature and pressure during the test should be stable within the specified range. 1) In this case, the number and frequency of displacements are determined by the operator and must be stated in the test report. 716
9 Test cycle
GB/T 10125-—1997
9.1 The test cycle should be selected according to the relevant standards of the tested material or product. If there is no standard, the recommended test cycles can be decided through consultation between relevant parties as 2h, 4h6h, 8h, 24h, 48h, 72h, 96h, 144h, 168h, 240h, 480h, 720h1000hu
9.2 The spraying shall not be interrupted during the specified test cycle. The salt spray box can only be opened when it is necessary to observe the sample briefly. 9.3 If the test endpoint depends on the time when corrosion begins to appear, the sample should be checked frequently. Therefore, these samples cannot be tested together with the samples that require a predetermined test cycle.
9.4 The samples of the predetermined test cycle can be visually inspected regularly (see 9.1), but the test surface cannot be damaged during the inspection. The time and frequency of unpacking inspection should be as short as possible.
10 Treatment of samples after the test
After the test, take out the sample. In order to reduce the shedding of corrosion products, place the sample in the room to dry naturally for 0.5-1h before cleaning. Then use clean running water with a temperature not high than 40°C to gently clean it to remove the salt spray solution remaining on the surface of the sample, and then use a hair dryer to dry it immediately. 11 Evaluation of test results
The evaluation criteria of test results should usually be proposed by the test material or product standard. General tests only need to consider the following aspects: a) Appearance after the test; b) Appearance after removing surface corrosion products; d) The distribution and quantity of corrosion defects such as pitting, cracks, bubbles, etc., which can be evaluated according to the methods specified in GB6461. GB12335 and the Appendix of GB/T9798--1997 ((ev1SO) 1462: 1973); e) The time when corrosion begins to appear; e) Weight change; f) Microscope observation; g) Changes in mechanical properties. 12 Test report 12.1 The test report must state the evaluation criteria used and the test results obtained. If necessary, there should be test results for each specimen, the average test results for each group of identical specimens, or photos of the specimens. 12.2 According to the test purpose and requirements, the test report should include the following contents: a) the relevant standards referenced by this standard; b) the types of salt and water used in the test;
() description of the test material or product;
d) the size, shape, sample area and surface condition of the test specimen;
e) the preparation of the test specimen, including cleaning before the test and protection measures for the edges or other special areas of the test specimen; f) the known characteristics of the covering layer and the description of the surface treatment; g) the number of test specimens:
h) the cleaning method of the test specimen after the test, if necessary, the weight loss caused by cleaning should be stated; Adoption instructions:
1 Taking into account that the changes of the test specimens in the initial stage of the test are relatively large and in order to meet the requirements of various domestic products, compared with IS09227, "1h8h711" is added
i) the angle of the test specimen placement;
i) the frequency and number of sample displacements;
k) the test cycle and the intermediate inspection results; 1) the test solution and pH value;
GB/T 10125
5—1997
m) Performance of reference samples placed in the salt spray chamber to check the accuracy of the test conditions; n) Test temperature;
o) Density of the collected liquid;
p) Unexpected conditions that affect the test results;
q) Time interval for inspection.
Water seal groove
Insulation sleeve
Water in the collector
Plane 80cm2
Air outlet
Slant plate one
GB/T 10125--1997
Appendix A
(Suggestive Appendix)
Salt spray chamber design diagram
Temperature measuring hole
Compressed air
Compressed gas
Adjustable relative sprayer position pipe
Slant plate with angle
Salt dissolution wave
(1) GB 1771--91
GB/T10125-1997
Appendix B
(Suggestive Appendix)
References
Determination of resistance of paints and varnishes to neutral salt spray (eqvIS) 7253:1984) (2) GB 8013--87
General specification for anodic oxide coatings on aluminium and aluminium alloys (negIS0) 7599: 1983) (3) GB9791-88 Test method for chromate conversion coatings on zinc and cadmium (neqIS0) 3613: 1980) (4) GB/T9797-1997
(5) GB/T9798--1997
Metallic coatings Nickel + chromium and copper + nickel + chromium electrodeposited coatings (eqvIS0) 1456: 1988) Metallic coatings Nickel electrodeposited coatings (eqvIS0) 1458: 1988) Chromate conversion coatings on electroplated zinc and electroplated cadmium (eqvIS04520: 1981) (6) GB 9800---88
(7) GB/T13913-92 Specification and test methods for autocatalytic nickel-phosphorus coatings (eqvISO4527:1987) (8) 1SO 8993:1989
(9) 1SO 8994:1989
Anodic hydrogenated aluminium and aluminium alloys - Rating system for evaluating pitting corrosion - Anodic oxidation of aluminium and aluminium alloys - Rating system for evaluating pitting corrosion - Graphical method
Grid method2 According to the test purpose and requirements, the test report should include the following contents: a) the relevant standards referenced by this standard; b) the types of salt and water used in the test;
() description of the tested material or product;
d) the size, shape, sample area and surface condition of the test specimen;
d) the preparation of the test specimen, including cleaning before the test and protection measures for the edges or other special areas of the test specimen; f) the known characteristics of the covering layer and the description of the surface treatment; g) the number of test specimens:
h) the cleaning method of the test specimen after the test, if necessary, the weight loss caused by cleaning should be stated; Adoption instructions:
1 Taking into account that the changes of the test specimens in the initial stage of the test are relatively large and in order to meet the requirements of various domestic products, compared with IS09227, "1h8h711" is added
i) the angle of the test specimen placement;
i) the frequency and number of sample displacements;
k) the test cycle and the intermediate inspection results; 1) the test solution and pH value;
GB/T 10125
5—1997
m) Performance of reference samples placed in the salt spray chamber to check the accuracy of the test conditions; n) Test temperature;
o) Density of the collected liquid;
p) Unexpected conditions that affect the test results;
q) Time interval for inspection.
Water seal groove
Insulation sleeve
Water in the collector
Plane 80cm2
Air outlet
Slant plate one
GB/T 10125--1997
Appendix A
(Suggestive Appendix)
Salt spray chamber design diagram
Temperature measuring hole
Compressed air
Compressed gas
Adjustable relative sprayer position pipe
Slant plate with angle
Salt dissolution wave
(1) GB 1771--91
GB/T10125-1997
Appendix B
(Suggestive Appendix)
References
Determination of resistance of paints and varnishes to neutral salt spray (eqvIS) 7253:1984) (2) GB 8013--87
General specification for anodic oxide coatings on aluminium and aluminium alloys (negIS0) 7599: 1983) (3) GB9791-88 Test method for chromate conversion coatings on zinc and cadmium (neqIS0) 3613: 1980) (4) GB/T9797-1997
(5) GB/T9798--1997
Metallic coatings Nickel + chromium and copper + nickel + chromium electrodeposited coatings (eqvIS0) 1456: 1988) Metallic coatings Nickel electrodeposited coatings (eqvIS0) 1458: 1988) Chromate conversion coatings on electroplated zinc and electroplated cadmium (eqvIS04520: 1981) (6) GB 9800---88
(7) GB/T13913-92 Specification and test methods for autocatalytic nickel-phosphorus coatings (eqvISO4527:1987) (8) 1SO 8993:1989
(9) 1SO 8994:1989
Anodic hydrogenated aluminium and aluminium alloys - Rating system for evaluating pitting corrosion - Anodic oxidation of aluminium and aluminium alloys - Rating system for evaluating pitting corrosion - Graphical method
Grid method2 According to the test purpose and requirements, the test report should include the following contents: a) the relevant standards referenced by this standard; b) the types of salt and water used in the test;
() description of the tested material or product;
d) the size, shape, sample area and surface condition of the test specimen;
d) the preparation of the test specimen, including cleaning before the test and protection measures for the edges or other special areas of the test specimen; f) the known characteristics of the covering layer and the description of the surface treatment; g) the number of test specimens:
h) the cleaning method of the test specimen after the test, if necessary, the weight loss caused by cleaning should be stated; Adoption instructions:
1 Taking into account that the changes of the test specimens in the initial stage of the test are relatively large and in order to meet the requirements of various domestic products, compared with IS09227, "1h8h711" is added
i) the angle of the test specimen placement;
i) the frequency and number of sample displacements;
k) the test cycle and the intermediate inspection results; 1) the test solution and pH value;
GB/T 10125
5—1997
m) Performance of reference samples placed in the salt spray chamber to check the accuracy of the test conditions; n) Test temperature;
o) Density of the collected liquid;
p) Unexpected conditions that affect the test results;
q) Time interval for inspection.
Water seal groove
Insulation sleeve
Water in the collector
Plane 80cm2
Air outlet
Slant plate one
GB/T 10125--1997
Appendix A
(Suggestive Appendix)
Salt spray chamber design diagram
Temperature measuring hole
Compressed air
Compressed gas
Adjustable relative sprayer position pipe
Slant plate with angle
Salt dissolution wave
(1) GB 1771--91
GB/T10125-1997
Appendix B
(Suggestive Appendix)
References
Determination of resistance of paints and varnishes to neutral salt spray (eqvIS) 7253:1984) (2) GB 8013--87
General specification for anodic oxide coatings on aluminium and aluminium alloys (negIS0) 7599: 1983) (3) GB9791-88 Test method for chromate conversion coatings on zinc and cadmium (neqIS0) 3613: 1980) (4) GB/T9797-1997
(5) GB/T9798--1997
Metallic coatings Nickel + chromium and copper + nickel + chromium electrodeposited coatings (eqvIS0) 1456: 1988) Metallic coatings Nickel electrodeposited coatings (eqvIS0) 1458: 1988) Chromate conversion coatings on electroplated zinc and electroplated cadmium (eqvIS04520: 1981) (6) GB 9800---88
(7) GB/T13913-92 Specification and test methods for autocatalytic nickel-phosphorus coatings (eqvISO4527:1987) (8) 1SO 8993:1989
(9) 1SO 8994:1989
Anodic hydrogenated aluminium and aluminium alloys - Rating system for evaluating pitting corrosion - Anodic oxidation of aluminium and aluminium alloys - Rating system for evaluating pitting corrosion - Graphical method
Grid method
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.