Bright nickel plating has many advantages. It can not only save the heavy polishing process, improve operating conditions, save plating and polishing materials, but also improve the hardness of the coating, which is convenient for automatic production. However, the bright nickel coating contains sulfur, internal stress and It is brittle and its corrosion resistance is not as good as that of dark nickel plating. In order to overcome these shortcomings, a multi-layer nickel plating process can be used to significantly improve the mechanical properties and corrosion resistance of the coating.