Preparation of Silver/Silver-Graphene Composite Coatings by Brush Plating and Their Properties

The silver/silver-graphene composite coatings were prepared on copper substrate in KI system by electric brush plating technology. The effects of graphite content in electrolytes on adhesion, contact resistance, material phase, corrosion resistance and wear resistance of the composite coatings were investigated. The results show that the adhesion of both pure silver coating and composite coating met the standard requirements. The corrosion rates of the composite coatings were less than that of pure silver coating in NaCl and H₂SO₄ corrosive media, which was inverse in NaOH corrosion medium. The lowest average friction factor and wear rate of composite coatings were 0.274 and 5.68×10^-6 mg/(m·N), respectively, which was much smaller than that of pure silver coating, and the contact resistance of composite coating was not much different from that of pure silver coating.