The wiring harness terminals for current transmission in the vehicle wiring harness connectors are generally stamped from high-quality copper alloys. One part of the terminals should be fastened to the plastic shell, and the other part should be electrically connected with the mating terminals. The copper alloy Although it has good mechanical properties, its performance in electrical conductivity is not satisfactory. Generally, materials with good electrical conductivity have average mechanical properties, such as tin, gold, silver, etc. Therefore, plating is extremely necessary to provide terminals with acceptable electrical conductivity and mechanical properties at the same time.