Electro-gold plating process is a metal surface treatment process, mainly used in the metal surface coated with a layer of metal gold film to improve its appearance and performance. Electroplated gold plating layer corrosion resistance, good conductivity, easy to weld, high temperature, and has a certain degree of abrasion resistance (such as doped with a small amount of other elements of hard gold), has a good resistance to discolouration, while the gold alloy layer has a variety of shades, gold plating on silver can prevent discolouration. And the plating of the ductility is good, easy to polish, it is often used for decorative plating, such as plating jewellery, watch parts, works of art, etc.; also widely used in precision instruments and meters, printed circuit boards, integrated circuits, electronic tube shells, electrical contacts, etc. Requirements for long-term stability of electrical parameter performance of the parts of the electroplating. However, due to the high price of gold, the application is subject to certain restrictions.