Generally, the coating of the connector is divided into: gold-plated, silver-plated and tin-plated; the thickness of the different coating is also different according to the application requirements; and the main function of the connector coating is: ① good conductivity; ② reduce impedance; ③ Improve strength and wear resistance; ④ Anti-corrosion.
The role of the metal coating of the USB connector socket is mainly manifested in five aspects, as follows:
First, the USB socket with metal coating is not easy to be oxidized and vulcanized.
Second, the use of metal plating can optimize the electrical performance of the USB socket and maintain the impedance of the USB socket.
Third, the use of metal plating in the USB connector socket can improve its mechanical properties to a certain extent and enhance wear resistance.
Fourth, the metal contact of the precious metal coating to the connection interface is relatively simple, and the stability of the contact interface impedance of the USB connector socket is maintained.
Fifth, the surface of the metal coating will be covered with a layer of oxide film to prevent the oxide film from cracking when the USB connector socket is mated, and to ensure that the contact interface is not oxidized.
