The coating is actually a protective film relative to the outer side of the protective connector. If there is no coating, the wire to plate connector will be oxidized and corroded by air. In fact, the role of the coating is not only this, but also some other functions.

1. With coating, the connector is not easy to be oxidized, corroded and vulcanized.

2. With coating, the connector can also improve its mechanical properties to a certain extent and increase the service life of the connector.

3. At the same time, it can also optimize the electrical performance of the connector, build and maintain stable connector impedance.

4. The precious metal coating is relatively simple for the metal contact that produces the interface, and maintains the stability of the contact interface impedance.

5. What's more important is that there is an oxide film on the surface of the common metal coating, which ensures that the oxide film will be destroyed when the connector is matched, and the contact interface will not be oxidized.