The optimization of electrical performance can be considered from the control of the existing and upcoming film on the surface of the contact coating. Header Header A major requirement for electrical performance is to establish and maintain a stable header and header impedance. To achieve this, a metal contact interface is required to provide such inherent stability. Establishing such a contact interface requires that the surface film can be avoided or split during contact mating. These two different options clarify the difference between precious or rare metals and common metals.   

To varying degrees, precious metal coatings (such as gold, palladium and their alloys) are essentially free to the surface film. It is relatively simple for these coatings to create an interface metal contact, as it only requires that the companion of the contact surface move during mating. This is usually easy to achieve. In order to maintain the stability of the contact interface impedance, the pin header design requirements should pay attention to maintaining the contact surface precious metal properties to prevent external factors such as contaminants, the diffusion of base metal and the impact of contact wear.   

Ordinary metal coatings, especially tin or tin alloys, are naturally covered with an oxide film. The role of tin contact plating is because this layer of oxide is easily destroyed during mating, so metal contact is easily established. Pin header The requirement of the header design is to ensure that the oxide film breaks when the header and header are mated, and to ensure that the contact interface is no longer oxidized during the validity period of the electrical connector. Reoxidative corrosion is the most important performance degradation mechanism of tin contact plating in wear corrosion. Pin headers The mother silver contact plating is best considered as a common metal plating because it is susceptible to corrosion by sulfides and chlorides. Due to the formation of the valve valve, nickel plating is usually regarded as a common metal.