1. Anti-corrosion (such as nickel plating, chromium, zinc, etc.)

Usually the original material such as copper, iron, etc. is easily oxidized in the air, and plating a layer of metal with strong anti-oxidation ability can improve the corrosion resistance of the terminal.

2. Enhance electrical conductivity (such as gold plating, silver, etc.)

The original material such as iron, phosphorus copper conductivity is usually below 20%, for low-impedance connectors can not meet the requirements, so the surface of the high-conductivity metal such as gold plating can reduce its impedance.

3. Enhance plating adhesion (such as copper plating)

For metals with poor adhesion, a copper substrate is usually used to enhance adhesion before plating.

4. Improve solderability (such as gold plating, tin, etc.)

The material has poor adhesion to tin, and the surface is plated with a certain thickness of tin and the like to improve the solderability of the part.

5. Beautiful (such as gold plating, silver, nickel, etc.)

After plating, the terminal metal usually has a more glossy appearance than the material.