The contact body of the connector aviation plug is the core part to complete the electrical connection function. Generally, a contact pair is composed of a male contact piece and a female contact piece, and the electrical connection is completed by the insertion of the female and male contact pieces. The electroplating treatment of the connector aviation plug is very important. Generally, gold is used for the plating, but the base of the plating is different, including: gold plating on copper, gold plating on silver, and gold plating on nickel.
1. Gold-plated copper bottom: The gold-plated copper bottom has good salt spray resistance, is not easy to rust, and the surface is not easy to oxidize. And the finished product is fuller and brighter than the nickel-plated gold. Moreover, copper can completely isolate the protective substrate, and copper as a substrate can increase the adhesion stability of the electroplated surface. If the flatness of the substrate is not ideal, copper plating can also be used to improve it. However, the copper ions in the copper plating layer easily penetrate into the gold plating layer, which will gradually change the color of the gold plating layer, and the copper plating layer is easily passivated in the air, which affects the bonding force of the gold plating layer.
2. Gold-plating on the silver bottom: the silver-plated layer is contaminated and turns black easily through the pores of the plating, so this process is generally not used.
3. Gold plating on nickel: nickel can block the diffusion of elements such as copper and zinc on the substrate to the surface, avoiding appearance discoloration and poor electrical contact. At the same time, nickel is more inert than gold, which can ensure that the gold-plated parts have a higher resistance to atmospheric corrosion. In particular, the high-phosphorus nickel/gold coating can be far lower than the standard for the thickness of military gold-plated parts, and its resistance to salt spray, nitric acid vapor, sulfur dioxide and other tests are similar, such as 0.2 micron high-phosphorus nickel/gold coating It can pass the 48-96 hour neutral salt spray test.