The reasons for tinning copper terminals are as follows:

Anti-oxidation: Copper is easy to oxidize, and the oxidized copper terminal has poor contact and poor electrical conductivity, which will bring hidden dangers to future use. After tinning, a protective film can be formed to avoid direct exposure of copper terminals to the air and effectively prevent oxidation.

Improve electrical conductivity: After the copper terminal is tinned, a uniform film is formed on the surface, which can effectively improve its electrical conductivity, reduce resistance, improve transmission efficiency, and ensure the stable transmission of signals.

Prevent corrosion in a humid environment: In a humid environment, copper is easy to generate corrosion products such as patina, affecting the performance of terminals. After tinning, it can prevent the formation of patina and improve the corrosion resistance of terminals.

Increased aesthetics: tinned copper terminal surface smooth and glossy, look more beautiful.

In summary, tinning on the surface of copper terminals can resist oxidation, improve electrical conductivity, prevent corrosion and increase aesthetics.