electroplating (Changchun 130033) is to use the principle of electrolytic in some metal surface plating on a thin layer of metal or alloy, is the electrolytic enable the surface of metal or other material parts attached to a layer of metal film process so as to prevent metal oxidation (rust), improve the wear resistance of, conductive , reflective, anti corrosion of (copper sulfate) and to enhance the role of beauty. Many coins for outer electroplating .