Types of electroplating

1) Copper plating: used as a primer to improve the adhesion and corrosion resistance of the electroplating layer. (Copper is easy to oxidize. After oxidation, the patina is no longer conductive, so copper-plated products must be protected by copper)

2) Nickel plating: used as a primer or as an appearance to improve corrosion resistance and wear resistance (among them, chemical nickel is more wear-resistant than chrome plating in modern technology). (Note that many electronic products, such as DIN heads and N heads, no longer use nickel as the base, mainly because nickel is magnetic, which will affect the passive intermodulation in the electrical performance)

3) Gold plating: Improve conductive contact resistance and improve signal transmission. (Gold is the most stable and most expensive.)

4) Palladium-nickel plating: Improves conductive contact resistance, improves signal transmission, and has higher wear resistance than gold.