Metal plating connector – Why do connectors use metal plating?

Metal plating connector or metal connector are one kind of connectors, it is to prevent external factors such as pollution, diffusion of the base metal, and contact wear.

　　The plating used in the connector is divided into two types:

　　 1. The characteristics of using a precious metal coating

　　 To varying degrees, precious metal coatings (such as gold, palladium and their alloys) are essentially free from surface films. For these coatings, the metal contact that produces the interface is relatively simple, because it only requires the movement of the companions of the contact surface during mating. Usually, this is easy to achieve. In order to maintain the stability of the impedance of the contact interface, the connector design requires that the noble metal coating on the contact surface should be maintained.

　　The metal plating connector

　　2, the characteristics of using an ordinary metal coating

Ordinary metal coatings, especially tin or tin alloys, are naturally covered with an oxide film. The function of the tin contact plating layer is because this layer of oxide is easily destroyed during mating so that the metal contact is easily established. The requirement of electrical connector design is to ensure that the oxide film ruptures when the connector is mated and to ensure that the contact interface is no longer oxidized during the effective period of the electrical connector. Re-oxidation corrosion, in wear corrosion, is the most important performance degradation mechanism of tin contact plating. The silver contact coating is best regarded as an ordinary metal coating because it is susceptible to corrosion by sulfides and chlorides. Due to the formation of the valve material, the nickel plating layer is usually regarded as an ordinary metal.

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