Gold plating is used to prevent copper from rusting, as the oxide layer generated after rusting increases resistance, thereby affecting the stability and functionality of the probe.

The gold plating layer has good ductility, easy polishing, high temperature resistance, and excellent resistance to discoloration. Gold plating on the silver layer can prevent silver from changing color, so it is commonly used as a decorative coating, such as plating jewelry, clock parts, artworks, etc.

Gold plating has low contact resistance, good conductivity, easy soldering, strong corrosion resistance, and a certain degree of wear resistance, making it widely used in precision instruments, printed circuit boards, integrated circuits, casings, electrical contacts, and other fields.

We know that gold plating literally refers to plating gold, but in fact, what we mean by gold plating is not just plating the probe with gold. Before gold plating, we will first coat it with a layer of nickel. Nickel plating has high toughness and chemical stability. The cost of nickel plating is much lower than that of gold plating, and nickel plating can also achieve antioxidant and wear-resistant effects. However, its conductivity is not as good as gold plating. Reducing resistance and good conductivity are very important in the probe industry, so gold plating is used more frequently.

The appearance of the gold plating layer is golden yellow and has high chemical stability. The reason is that copper and gold elements are not easy to bond, and after gold plating, they may detach, which affects the use of the probe. However, plating a layer of nickel before gold plating can effectively solve this problem. Simply put, gold plating is to prevent copper from rusting. The copper green produced after rusting will increase the resistance, and the stability and functionality of the probe will also be affected.