Inspection before plating → chemical degreasing (the contact body with heavy oil stain is cleaned with organic solvent in advance) - hot water washing → running water cleaning → acid washing → running water washing → after docking, the plated parts are immersed in very dilute sodium carbonate solution, and the parts that are not in urgent need of electroplating are passivated and dried → the plated parts are poured into the drum → electrochemical degreasing → water washing → activation → running water washing → pure water washing → nickel plating (brass) Pre plating copper) → nickel recovery and cleaning → running water washing → pure water washing → pre gold plating → thick gold plating (hard gold) → secondary gold recovery and cleaning → running water washing → pure water washing → hot pure water washing → drying (temperature not exceeding 120 ℃) → inspection after plating.