This test method is applicable to checking the adhesion of metal coatings (such as tin and nickel) on wire and cable conductors. GB 4909.11-1985 Bare wire test method Coating adhesion test GB4909.11-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test methods for bare wlres
Test for adherence of coatlngLIDC 621.315.14
t620.178.4
GB 4900.11—85
The provisions of this standard are consistent with the relevant provisions of ASTMB33 (1981) and ASTMB355 (1980). 1 Scope of application
This test method is applicable to checking the adhesion of metal coatings (such as tin and nickel layers) on conductors of wires and cables. 2 Test equipment
2.1 Glass reel 250ml.
2.2 Test rod made of brass or steel, with polished surface. 2.3 Magnifying glass with magnification not exceeding 3 times and 7 times. 2.4 Winding device hand winding.
2.5 Reagents
2.5.1 Chemically pure sodium sulfide.
2.5.2 Benzene or ether.
3 Sample preparation
3.1 Sampling The sample should consist of 8 product packaging units (rings or discs). Cut a sample of about 300mm in length from each packaging unit.
3.2 PretreatmentbZxz.net
3.2.1 Wash the sample in an appropriate organic solvent such as benzene, ether or trichloroethylene for at least 3 minutes, and dry it with a clean soft cloth after taking it out.
3.2.2 Place the pretreated sample in a clean container and wait for the test. When handling the sample, do not touch the part of the sample immersed in the test solution with your hands, and take care to prevent damage to the surface of the sample. 4 Test steps
4.1 Preparation of sodium polysulfide solution
4.1.1 Dissolve chemically pure (CP) sodium sulfide crystals in distilled water until the solution reaches saturation at 20°C, then add sufficient sulfur (more than 250g/1), heat and stir to make it completely saturated. Let the solution stand for 24 hours and then filter to make a concentrated sodium polysulfide solution. 4.1.2 Dilute the appropriate concentrated sodium polysulfide solution with distilled water. The specific gravity of the obtained sodium polysulfide solution for the test should be 1.142 at 16°C. 4.1.3 Each portion of sodium polysulfide solution for the test should have a sufficient concentration to make a copper wire completely black within 5 seconds, otherwise the test solution should be treated as invalid.
4.1.4 The test solution is placed in a 250 ml measuring tube, each portion is 180 ml, and the temperature of the solution during the test is 16-21°C. 4.2 Wound test specimens
National Bureau of Standards Issued on January 31, 1985
Implementation on December 1, 1985
GB 4909.1185
4.2.1 Select the test bar according to the diameter specified in the product standard. 4.2.2 Slowly and evenly wind the test specimen spirally on the test bar by hand according to the provisions of Table 1. The distance between adjacent turns should be approximately equal to the diameter of the test specimen. Care should be taken not to stretch the specimen during winding. Table 1 Nominal diameter and number of windings
Nominal diameter of test specimen dmm
4. Oil-immersed test specimens
Number of winding turns
Remove the test specimen from the test bar and completely immerse its spirally wound part in the sodium polysulfide solution for 30s. 4.4 Cleaning
After removing the specimen from the sodium polysulfide solution, rinse it immediately with clean water and carefully shake off the water droplets on the surface. 4.5 Inspection
Inspect the outer circumference of the spirally wound part of the sample according to the provisions of Table 2. Table 2
Sample Bonding Layer
Tinning Layer
Plating Layer
5 Test Results and Calculation
Sample Nominal Diameter dmm
All Specifications
5.1 The outer circumference of the spirally wound part of the sample should not be black, and the coating should have no cracks. Inspection Method
Magnifying glass, not more than 3 times
Magnifying glass, not more than 7 times
5.2 If all 8 samples are qualified, the coating adhesion of the batch of products is judged to be qualified. If 3 or more samples are unqualified, the batch should be checked piece by piece. If the number of unqualified samples is 2 or less, 8 samples should be randomly selected from the remaining packaging units of the batch for re-testing. If the second test is still unqualified, it should be checked piece by piece. Additional Notes:
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 Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Cable Research Institute of the Ministry of Machinery Industry and others. The person in charge of drafting this standard is Fan Man'e.
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