Electrical contact parts to be frequently plugged or broken, not only requires wear resistance and good electrical conductivity, the coating requirements are very high, gold than silver chemical stability and hardness are not much worse than silver, solderability is also very good, in order to the stability of electrical appliances, gold plating is better than silver plating.

The terminal is an accessory product used to realize electrical connection, which is divided into the category of connectors in industry. With the increasing degree of industrial automation and the more stringent and accurate industrial control requirements, the amount of terminal terminals is gradually rising. With the development of the electronics industry, the use of terminals is more and more, and the variety is also more and more. At present, the use of a wide range of in addition to PCB board terminals, there are hardware terminals, nut terminals, spring terminals and so on.