Brush plating process and study on corrosion resistance and hardness of modified graphene on copper-based silver-graphene composite coating

Abstract

Electrical contact material is the key to the work of isolation switch electrical system. The sterling silver coating often used cannot meet the current requirements of power transmission equipment because of contact heat caused by oxidation and wear, corrosion resistance and wear resistance. In this paper, graphene was added to silver brush plating bath to prepare graphene uniformly suspended silver-graphene composite plating bath, and silver-graphene composite coating was prepared on pure copper by brush plating technology. The optimum process parameters of silver-graphene composite coating were obtained by adjusting brush plating voltage and brush plating time. The results show that the self-corrosion potential of silver-graphene composite coating is slightly lower than that of pure silver coating, and the self-corrosion current is lower, indicating that the corrosion resistance of silver-graphene composite coating is better. Under different brush plating voltages, the coating shows the most positive corrosion potential and the lowest self-corrosion current density at 3V, and the corrosion resistance is the best at 2min under different brush plating time. When the graphene content is 30g/L, the binding rate between graphene and silver coating is the highest, the thickness of the coating is 23.5μm.

Keywords:
Brush plating; Silver-graphene composite coating; Corrosion resistance; Electrical contact materials