The plating of the pin row can improve the electrical performance
Release time:
2023-05-24
Electrical performance can be optimized in terms of the control of existing and to be formed films located on the surface of the contact coating. One of the major requirements for the electrical performance of a pin and bus is to establish and maintain a stable pin and bus impedance. For this purpose, a metal contact interface is required to provide this inherent stability. The establishment of such a contact interface requires the surface film to avoid or split during contact fit. These two different options define the distinction between precious or rare metals and common metals.
Electrical performance can be optimized in terms of the control of existing and to be formed films located on the surface of the contact coating. One of the major requirements for the electrical performance of a pin and bus is to establish and maintain a stable pin and bus impedance. For this purpose, a metal contact interface is required to provide this inherent stability. The establishment of such a contact interface requires the surface film to avoid or split during contact fit. These two different options define the distinction between precious or rare metals and common metals.
To varying degrees, precious metal coatings (such as gold, palladium, and their alloys) are intrinsically free to the surface film. For these coatings, metal contact at the interface is relatively simple because it requires only the movement of the concomitant of the contact surface. Usually this is easy to do. In order to maintain the stability of the impedance of the contact interface, the design requirements of the pin and busbar should pay attention to the precious metal of the contact surface to prevent the influence of external factors such as pollutants, the diffusion of base metal and contact wear.
Common metal coatings, especially tin or tin alloys, are naturally covered by a layer of oxide film. The tin contact coating works because the oxide layer is easily destroyed during mating so that metal contacts can easily be established. The design requirements of the pin and bushing are to ensure that the oxide film breaks when the pin and bushing match, and ensure that the contact interface is no longer oxidized during the validity period of the electric attachment. Reoxidation corrosion, in wear corrosion, is the main degradation mechanism of tin contact coatings. Silver contact coatings are best treated as common metal coatings because they are susceptible to corrosion by sulfides and chlorides. Because of the formation of the valve, the nickel coating is usually considered as a common metal.
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