The appearance of the gold -plated layer is golden yellow and has high chemical stability. It is only dissolved in the king water and other super strong acids, and insoluble in other acids. Gold's atomic price is one -price and three -valent. The standard potential φ ° AU+/AU of one -price gold is+1.68V, and the standard potential φ ° AU3+/AU of the three -price gold is+1.50V. For steel, copper, silver, and its alloy matrix, the gold coating is a cathode coating, and the pores of the plating layer affect their protective performance.

The gold -plated layer has good ductility, easy to polish, high temperature resistance, and has good resistance to color resistance. Gilling on the silver layer can prevent the discoloration of the silver; the gold -alloy coating can present a variety of tones, so it is often used as a decorative plating layer, such as plating jewelry, watch parts, artworks, etc.

Electric connection points are widely used.