Copper tin plating process usually has two methods: hot tin plating and electroplating tin plating. Tin plating can not only increase the corrosion resistance and oxidation resistance of copper busbar connectors, but also improve their conductivity and thermal conductivity. However, due to various factors, the surface of copper busbars is prone to blackening after tin plating.
Firstly, there are issues with the storage environment of copper busbar connectors. The tin plating layer on the surface of copper busbars in high temperature, high humidity, and high oxygen concentration storage environments may undergo oxidation reactions, leading to blackening of the copper busbar surface.
Secondly, the composition of the tin plating solution is poor. The quality of tin plating solution varies depending on its composition. If there are too many impurities, moisture, or other harmful components in the tin plating solution, it will cause the tinned product to turn black.
Finally, the coating thickness is uneven. If the coating thickness is uneven, it will cause local coating to be too thick, and these overly thick coatings are prone to oxidation reactions, leading to blackening.
