Baiya Electronic

Tinned copper discoloration: tinned copper in the copper bar has hot tin plating and electroplating tin, these two kinds of tin plating will exist on the surface of the copper blackening phenomenon, if there is no discoloration phenomenon after the completion of tinning, and after a few days there is a phenomenon of blackening discoloration, there are several possible existence,
First, it is the environment of the storage space of the t2 copper bar. If the environment is bad, it will directly lead to the blackening of the tin layer.
Second, the purity of tin itself is not enough, too much impurities will also accelerate the process of oxidation black;
Third, there are pollutants in the tinned copper layer, including the surface directly touched by hands without gloves, etc., and the tinned copper bar has turned yellow, indicating that it has been oxidized. If it is copper oxidation on the circuit board. The flux used in tinning of your product does not protect the lead surface after tinning.