JB/T 8177-1999 General technical requirements for hot-dip galvanized coating of insulator metal accessories
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T8177
1999-08-06
Wa Xian Ji Dong
2000-01-01
JB/T8177
This standard is B/T1.1--953 standard. Part 1: Standard preparation. According to this regulation, the technical conditions of 8377:95 insulator heat transfer layer are revised and discussed. The format and specifications are in accordance with G8T1.1--1993. According to IFC60168:1994 standard for test of external porcelain or glass post insulators for systems above 1005V, 1E603831:79846 standard for test of 1000V transformer line insulators for systems above 1000V, part 1: definition, test methods and acceptance criteria for porcelain or glass insulator components for systems below 1000V, the test procedure for galvanizing has been modified, and the thickness of the coating of cast steel parts has been modified according to IFC regulations, and the technical content remains unchanged. This standard replaces 3B/T8177--95 from the date of implementation, and this standard is proposed by the National Technical Committee for Insulator Standardization. The origin of this standard is: Xi'an Electric Ceramics Research Institute. The main points of this standard are: project management, engineering, and transformer management. This standard is to be explained by the Medical Safety Porcelain Research Institute. 1 Scope JB/T81771999 JB/T817795 This standard specifies the general quality requirements for the hot-dip galvanized layer of insulator accessories and their corresponding test methods. The special quality requirements for the zinc layer and the special zinc test methods are not included in this standard. This standard is applicable to the hot-dip galvanized layer (referred to as the hot-dip galvanized layer) of insulator metal parts (referred to as the hot-dip galvanized layer) made of steel and other materials. This standard covers the zinc layer on the accessories before and after assembly. 2 Reference standards The provisions contained in the following standards are cited in this standard as the original text of this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and the parties using the name of this standard should consider the possibility of using the latest version of the subscript. GB/T470--1983
GB/T 2900. 8---1095
JB/T8176--1999
3 Definitions
Electrical terminology
Terminology definitions used in the standard for pin insulators for power and communication lines shall comply with GB/T2900.84 Technical requirements
4.1 The zinc ingots used for hot-dip galvanizing shall comply with the provisions of GB/T470. The zinc content (quality) in the galvanizing operation area shall not be less than 98.5%, 4.2 Appearance quality
a) The zinc layer shall be continuous, uniform and smooth:
b) The zinc layer shall be attached to the underlying parts, and the zinc layer bonding strength test shall be carried out when required:
c) The inner surface of the attachment and the adhesive shall be fused, and its appearance quality shall be specified by the corresponding accessory standard. The outer surface of the accessories for line insulators shall not be embedded with zinc. For other insulators, the outer surface zinc defect area shall meet the requirements of Table 1 for all insulation zinc layer damage areas;) Any protruding defects (such as zinc piles, zinc slag, melt scars and burrs, etc.) shall not affect the assembly and installation of accessories. The degree of each protrusion shall not exceed 1 mm
Table 1 The maximum width (or dead diameter) of the zinc-deficient area or frontal layer collision and withdrawal of the attachment
>210~350
1, the meaning of the following average period,
1999-08-06
Annual total area
Not more than mn"
2000-01-01 cable
JB/T81771999
4.3 The quality of the zinc layer per unit area and the corresponding zinc layer thickness and the "certain acid word vulgar decision" should be studied, and the minimum annual quality barrier and its allowable degree should meet the requirements of Table 3. Table 2 The amount of zinc per unit area, thickness and "ceramic acid pot solution method" per unit area pressure||t t||Accessory types
Iron parts
Other steel parts
External thread and threaded part
Expanded diameter nut threaded part and washer
Accessory types
Casting iron parts and steel parts
Other steel parts
[Single groove value, not less than the calculated average value, not less than g/m
Metal test pieces
Single test piece
Minimum thickness of the layer
All test pieces Single test piece!
Minimum thickness and use
General medical condition
(uneasy)
Small thickness and softness
Accessories with internal threads (excluding expanded diameter screws), the internal thread Some parts are not tested according to Article 4.3. Note: For external threads and expanded diameter threads, the size and tolerance before reading shall comply with the requirements of 1B Section 3175. 5 Sampling plan and acceptance rules
For the sampling plan and acceptance rules of the parts, in addition to complying with the relevant provisions of the insulator accessories standard, the number of samples for each individual test of "weighing method", "micro-effect removal" and "filament method", as well as the results of all layer tests, the weight of the test, the test items, etc. shall also comply with the provisions of this standard.
Test procedure
The key zinc coating shall be subjected to external inspection, and the magnetic test method shall be used to determine the quality of the coating. When the results of the magnetic test method are satisfactory, the following types of tests shall be carried out:
--For cast Iron parts, steel parts, and other steel parts can be weighed by the agreed weighing method. For bad prices, nuts or washers, use the microscope method. The buyer can use other inspection methods by agreement, such as the liquid drop method, the star method, or the cleaning method.
7 Test method
7.1 Appearance inspection
Use the magnetic layer to inspect and measure the sample if necessary.
7.2 Determine the average thickness of the zinc layer with a magnetic layer measuring instrument (referred to as the magnetic layer method) 7.2.1 Sample processing and requirements
The sample should be taken from a batch of products (made by two processes and one method) after the appearance and size inspection. Before the test, the oil stains and impurities on the zinc layer of the sample should be cleaned. The test piece should not have magnetism (e.g., the product purchased by the tester for nondestructive testing). If magnetism exists, it must be demagnetized. 7.3.2 Use only the D-type layer measuring instrument (magnetic twist type) recommended by JB/T81771999 or other equivalent measuring instruments, and the probe diameter should not exceed M. 7.2.3 Test method During the test, the diameter should be measured strictly in accordance with the specifications provided by the test instrument manufacturer or the instrument instruction manual. The measuring points shall be randomly and evenly distributed over the zinc layer surface of the whole test sample, except for the edges and corners of the test sample. The number of measuring points shall be in accordance with the provisions of section 4: The number of measuring points is less than the arithmetic average of the zinc layer floating degree of each test sample. The measured values of the whole test sample and all the test samples shall meet the specified value requirements. If all the items are unqualified, the number of repeated tests shall be doubled. All three items shall be qualified to pass the test. If the measured average values of all the test samples are qualified, but the measured average values of one or more single test samples are not qualified, the test shall be repeated on the same test sample in the same group. After repeated tests, the measured average values of the three items shall be qualified, and the test shall be passed. If the average value of a single sample is qualified, but the average value of all samples is not qualified, the sample shall be subjected to the “weighing method” in Article 3 of this standard for a test. If the minimum zinc layer friction is not satisfactory, the same number of samples shall be sampled for repeated testing. If qualified, the test is passed. 7.3 Determination of unit density zinc layer mass by old film test (referred to as weighing pan method) 7.3.1 Sample handling and requirements
The sample shall be randomly sampled from the same batch of products that have been inspected for appearance and size (generally recommended as the main batch). Before the test, the sample shall be cleaned of clothing. If necessary, the sample shall be decontaminated with an organic agent that does not corrode the zinc layer, such as tri-crystal (CIIC). For larger samples, it is allowed to test in pieces, and the minimum area of the cut piece is less than 200m. 7.3.2 Stripping Solution Preparation
Dissolve about 3.2 g of SbCl2 or 2 g of SbD in 0.1% concentrated HCl (3.19 g/ml), then dilute the solution to 1000 ml with distilled water. The prepared stripping solution should contain at least 10 ml of solution per cubic meter of zinc layer on the test piece, but not more than 20 ml. 7.3.3 Experimental procedure
During the test, the prepared test pieces or cut pieces shall be weighed one by one with an accuracy of one thousandth of a gram. The test pieces shall be completely immersed in the concentrated solution with air until the zinc layer is completely dissolved. The end of the dissolution process can be determined by the fact that the emission of hydrogen from the solution has almost stopped. Then rinse the test piece in running water. If necessary, brush off any residue that may be adhering to the surface and immerse it in alcohol. Take out the air and dry it for about 1 hour. After the test piece is cooled, weigh it with the above accuracy. 7.3. 4 Calculation of zinc mass and judgment of test results The mass of zinc layer per unit area, Am, shall be calculated according to the following formula: Am = m:-mg
The mass of zinc layer per unit area, m. According to (2) calculation: Am×10%g/m
Where: m——-mass of demoulding test piece, 1m2 of membrane test piece area,
S—zinc layer decay area of product (or cut piece), mm\$Measured or calculated value should be accurate to 0.1mm. (
JB/T81771999
Test result judgment: If m. is equal to or greater than the specified value, it is qualified. The average value of the cumulative mass of zinc is 2n. The approximate thickness can be converted as follows (assuming that the density of zinc is 7/cm): um
74 The uniform thickness of zinc layer measured by metallographic microscope (metallographic microscope method) 7.1.1 The test section of the sample is cut from the effective zinc layer of the sample (the screw thread of the zinc bottom is not damaged before the work). The zinc layer should be cut again during cutting, grinding and polishing. The pressure and the degree of abrasive applied during grinding should be appropriate to the degree of the layer. The force applied should be consistent with the fracture point. When the grinding rate is certain, the workpiece is moved again, and the pressure applied is increased to a small value until the surface is gradually flat. Then polish it on a flat polishing wheel, and then use ethyl acetate to avoid slipping and drying. The cross section is fully corroded, taken out and rinsed with water, and the cross section is cleaned and dried. The composition of the corrosive agent is: 2g chromium trioxide (CrO), 1.5g sodium alkali NaS0) and 103ml boiling water. 4.2 Microscope measurement and result judgment
The prepared cross section to be measured is measured on a metallographic microscope. The measurement should be strictly in accordance with the instrument specification and the continuous performance is improved. The thread surface is measured at one point, and the three points are measured. The average value of the three points is taken as the actual thickness of the test piece. The thickness is evaluated from the zinc surface to the interface between the zinc layer and the iron-zinc alloy. The arithmetic average of the measured zinc layer thickness of a single test piece and all the test pieces (recommended as only one test piece) shall be considered as the test result if the test reaches the specified value.
7.5 Uniformity of zinc layer test by acid-sodium solution (referred to as sodium sulfate solution method) 7.5.1 Sample treatment and requirements
The test pieces shall be randomly selected from the same batch of products that have passed the appearance inspection. The test pieces shall be cleaned with a clean surface, and all the residues shall be removed by washing with a silicone or other appropriate solution, and then immersed in a 25% acid solution. The test pieces shall be rinsed in running water and wiped dry with a clean soft cloth.
Zinc-deficient and zinc-contaminated parts shall be marked. For parts that are not required to be galvanized or not to be tested, paraffin or other coatings may be used without covering them. For the inner cavity or base of tubular parts that are not required to be galvanized or not to be tested, they may be sealed with plugs. 7.5.2 Preparation of copper sulfate solution and related requirements For every 100 ml of distilled water, add 35 g of chemically pure crystalline copper sulfate (Cu2SO4,·0), add carbonic acid (CuCO3), or hydroxide (Cu2O4), or copper oxide (Cu2O4) to every 1310 ml of copper sulfate solution, and separate. The prepared solution is allowed to stand for not less than 24 hours. Filter or slowly pour off the condensed solution and discard the precipitate. The density of the prepared copper sulfate solution at 20°C should be (1.1 ± 0.10) g/ml. The container for holding the copper sulfate solution should be made of ceramic, glass, porcelain or other materials that do not react with the solution. The inner cavity of the test container should ensure that when the sample is immersed in the solution, the distance from the outer wall of the container is less than 25 mm.
The zinc spreading area of the square centimeter should be at least 5l of liquid. 7.5.3 Test procedure
Completely condense the prepared sample into a sodium sulfate solution with a density of (20±4) for 1 day. The liquid should always be kept within the standard range. During immersion, the sample and the solution should not be stirred, and the sample and the container should not be in contact with each other. When the sample reaches the immersion point, it should be quickly taken out and immediately washed in a clean and vigorous manner, and the sediment should be brushed off with a brush, and then wiped with a clean cloth, and the appearance should be inspected. The above process is counted as one test.
After the specified number of tests for each sample is completed according to the above provisions, the solution should not be used anymore. Except for the last cleaning, the sample should be immediately immersed in the solution after the appearance inspection. 7. 5.4 Test result judgment
JB/T8177
After the test piece is disassembled and tested for a certain number of times, it shall be inspected and checked. There shall be no red metal copper attached to the sample each time. If there is any separation from the steel pipe, it shall be rubbed with a hard-shelled tool. If the steel is exposed, it is considered qualified, and if the iron base is exposed, it is considered unqualified. Any tiny red metal attachment on the edge or corner of the surface is allowed to exist. If one or more samples fail to meet the specified test times in the above tests, it is allowed to take double the samples for repeated tests. If one or more samples still fail to meet the specified test times after repeated tests, the test is unqualified. 7.6 Zinc layer Combined strength test (chain knife test): The parts are clamped in a vise, and the edge of the knife is tightened. The knife and the surface of the chain layer are at an angle of 45 degrees. From the circumference of the base metal to the chain direction, the key layer shall not be exposed or fall off. It is recommended to use one test piece. If it fails, two pieces should be selected for repeated testing. If one piece still fails during the test, this test is not passed.
Xie, fortunately, the cavity is only applicable to the missing accessories 5
lai880b1230
19XXXX岭
100044
黛段X/X
张準XXX,XXX
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鱻极藕亥5. Test for uniformity of zinc layer by using sulfuric acid solution (referred to as sulfuric acid solution method) 7.5.1 Sample treatment and requirements
The sample shall be randomly selected from the same batch of products that have passed the appearance inspection. The sample shall be cleaned with a clean surface, and all the residues shall be removed by washing with a silicone or other appropriate solution, and then immersed in the acid solution for 15 minutes. The sample shall be rinsed carefully in running water and wiped dry with a clean soft cloth.
The zinc-deficient and zinc-contaminated parts shall be marked. For the parts that are not required to be galvanized or not to be tested, the wax or other coatings may be used without covering them. For the inner cavity or base of the tubular parts that are not required to be galvanized or not to be tested, they may be sealed with plugs. 7.5.2 Preparation of copper sulfate solution and related requirements For every 100 ml of distilled water, add 35 g of chemically pure crystalline copper sulfate (Cu2SO4,·0), add carbonic acid (CuCO3), or hydroxide (Cu2O4), or copper oxide (Cu2O4) to every 1310 ml of copper sulfate solution, and separate. The prepared solution is allowed to stand for not less than 24 hours. Filter or slowly pour off the condensed solution and discard the precipitate. The density of the prepared copper sulfate solution at 20°C should be (1.1 ± 0.10) g/ml. The container for holding the copper sulfate solution should be made of ceramic, glass, porcelain or other materials that do not react with the solution. The inner cavity of the test container should ensure that when the sample is immersed in the solution, the distance from the outer wall of the container is less than 25 mm.
The zinc spreading area of the square centimeter should be at least 5l of liquid. 7.5.3 Test procedure
Completely condense the prepared sample into a sodium sulfate solution with a density of (20±4) for 1 day. The liquid should always be kept within the standard range. During immersion, the sample and the solution should not be stirred, and the sample and the container should not be in contact with each other. When the sample reaches the immersion point, it should be quickly taken out and immediately washed in a clean and vigorous manner, and the sediment should be brushed off with a brush, and then wiped with a clean cloth, and the appearance should be inspected. The above process is counted as one test.
After the specified number of tests for each sample is completed according to the above provisions, the solution should not be used anymore. Except for the last cleaning, the sample should be immediately immersed in the solution after the appearance inspection. 7. 5.4 Test result judgment
JB/T8177
After the test piece is disassembled and tested for a certain number of times, it shall be inspected and checked. There shall be no red metal copper attached to the sample each time. If there is any separation from the steel pipe, it shall be rubbed with a hard-shelled tool. If the steel is exposed, it is considered qualified, and if the iron base is exposed, it is considered unqualified. Any tiny red metal attachment on the edge or sharp corner of the surface is allowed to exist. If one or more samples fail to meet the specified test times in the above tests, it is allowed to take double the samples for repeated tests. If one or more samples still fail to meet the specified test times after repeated tests, the test is unqualified. 7.6 Zinc layer Combined strength test (chain knife test): The parts are clamped in a vise, and the edge of the knife is tightened. The knife and the surface of the chain layer are at an angle of 45 degrees. From the circumference of the base metal to the chain direction, the key layer shall not be exposed or fall off. It is recommended to use one test piece. If it fails, two pieces should be selected for repeated testing. If one piece still fails during the test, this test is not passed.
Xie, fortunately, the cavity is only applicable to the missing accessories 5
lai880b1230
19XXXX岭
100044
黛段X/X
张準XXX,XXX
19XX集XX舱
德pxXX.XX翼bzxz.net
鱻极藕亥5. Test for uniformity of zinc layer by using sulfuric acid solution (referred to as sulfuric acid solution method) 7.5.1 Sample treatment and requirements
The sample shall be randomly selected from the same batch of products that have passed the appearance inspection. The sample shall be cleaned with a clean detergent, and all the residues shall be removed by using a flammable silicon solution or other appropriate solution. Then the sample shall be immersed in the acid solution for 15 minutes. The sample shall be rinsed carefully under running water and wiped dry with a clean soft cloth.
The zinc-deficient and zinc-contaminated parts shall be marked. For the parts that are not required to be galvanized or not to be tested, the wax or other coating may be used without covering. For the inner cavity or base of the tubular parts that are not required to be tested or not to be tested, they may be sealed with plugs. 7.5.2 Preparation of copper sulfate solution and related requirements For every 100 ml of distilled water, add 35 g of chemically pure crystalline copper sulfate (Cu2SO4,·0), add carbonic acid (CuCO3), or copper hydroxide (Cu2O4), or copper oxide (Cu2O4) to every 1310 ml of copper sulfate solution, and separate. The prepared solution is allowed to stand for not less than 24 hours. Filter or slowly pour off the condensed solution and discard the precipitate. The density of the prepared copper sulfate solution at 20°C should be (1.1 ± 0.10) g/ml. The container for holding the copper sulfate solution should be made of ceramics, glass, porcelain and other materials that do not react with the solution. The inner cavity of the test container should ensure that when the sample is immersed in the solution, the distance from the outer wall of the container is less than 25 mm.
The zinc spreading area of the square centimeter should be at least 5l of liquid. 7.5.3 Test procedure
Completely condense the prepared sample into a sodium sulfate solution with a density of (20±4) for 1 day. The liquid should always be kept within the standard range. During immersion, the sample and the solution should not be stirred, and the sample and the container should not be in contact with each other. When the sample reaches the immersion point, it should be quickly taken out and immediately washed in a clean and vigorous manner, and the sediment should be brushed off with a brush, and then wiped with a clean cloth, and the appearance should be inspected. The above process is counted as one test.
After the specified number of tests for each sample is completed according to the above provisions, the solution should not be used anymore. Except for the last cleaning, the sample should be immediately immersed in the solution after the appearance inspection. 7. 5.4 Test result judgment
JB/T8177
After the test piece is disassembled and tested for a certain number of times, it shall be inspected and checked. There shall be no red metal copper attached to the sample each time. If there is any separation from the steel pipe, it shall be rubbed with a hard-shelled tool. If the steel is exposed, it is considered qualified, and if the iron base is exposed, it is considered unqualified. Any tiny red metal attachment on the edge or sharp corner of the surface is allowed to exist. If one or more samples fail to meet the specified test times in the above tests, it is allowed to take double the samples for repeated tests. If one or more samples still fail to meet the specified test times after repeated tests, the test is unqualified. 7.6 Zinc layer Combined strength test (chain knife test): The parts are clamped in a vise, and the edge of the knife is tightened. The knife and the surface of the chain layer are at an angle of 45 degrees. From the circumference of the base metal to the chain direction, the key layer shall not be exposed or fall off. It is recommended to use one test piece. If it fails, two pieces should be selected for repeated testing. If one piece still fails during the test, this test is not passed.
Xie, fortunately, the cavity is only applicable to the missing accessories 5
lai880b1230
19XXXX岭
100044
黛段X/X
张準XXX,XXX
19XX集XX舱
德pxXX.XX翼
鱻极藕亥
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