QJ 481-1990 The test method for the resistance to alternating heat and humidity of metal plating layer explains the relevant operation procedures of the metal coating for the damp heat test, as follows: QJ 481-1990 Metallic coating layer is tested in the method of resistance to alternating heat and humidity The relevant operating procedures for the coating during the damp heat test are as follows:
1. Sample preparation Remove the dust and oil on the surface of the sample, check whether the sample is intact and whether the movable part is stuck, and carry out the original performance test and visual inspection, and make a record.
Second, high and low temperature alternating heat and humidity test chamber preparation According to the requirements of low temperature and high humidity stage, the temperature and humidity of the test box are debugged to the working state.
3. Stable temperature pretreatment of the sample Before the sample is placed in the test chamber, when the temperature is significantly different from the temperature of the test chamber, the sample should be subjected to temperature stability pretreatment in another test chamber.
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