The passivation process in the electroplating process is necessary to enhance the corrosion resistance and maintain the appearance of the electroplated product. Although zinc plating offers good corrosion resistance, it may still corrode in outdoor or strong acid/base environments, leading to the generation of zinc oxide or white rust. Therefore, passivation treatment is required to improve its corrosion resistance and decorative properties. The passivation process typically involves an acid treatment, such as acid washing to remove impurities and zinc oxide on the surface, followed by the generation of a corrosion-resistant film on the surface of the zinc coating. This method can achieve the goals of corrosion resistance, corrosion inhibition, and decoration of the zinc surface.

In summary, passivation treatment is a crucial step in the electroplating process, and it can effectively improve the corrosion resistance and decorative properties of the electroplated product, protecting its surface from external damage.