What are the methods to check the passivation effect of copper materials?
Testing method
1Constant temperature and humidity test method
This method is to place the passivated copper parts in a constant temperature and humidity test box with a test temperature of 50°C and control the humidity in the test box. Then, observe the discoloration of the surface of the test piece at intervals, and through the discoloration Speed, judge the quality of antioxidant treatment!
2 drops of nitric acid test method
This method requires 1:1 nitric acid according to QJ standards to quickly detect the antioxidant properties of copper and copper alloy surfaces. Use 1:1 nitric acid to drop on the surface of the anti-oxidation treated copper parts. The first bubble generated by the reaction must take more than six seconds!
3 Neutral salt spray test method
This is currently the most commonly used method in the metal surface treatment industry. By conducting tests under artificially simulated salt spray environment conditions, it only takes 24 hours to obtain the corrosion resistance of one year in a normal environment, which can truly reflect the passivation effect. bad.
