The post-treatment of galvanized steel strips includes three aspects: passivation, pre-phosphating, and oiling. First, the galvanized strip steel must be passivated, which can improve the surface structure and gloss of the galvanized layer, improve the corrosion resistance and service life of the galvanized layer, and improve the bonding force between the coating and the base metal. Passivation treatment mainly uses chromate passivation. Add some activators, such as fluoride, phosphoric acid, or sulfuric acid, to the passivation solution to obtain a thicker chromate film after passivation. When there is fluoride in the passivation solution, it can reduce the surface tension of the steel strip, accelerate the film-forming reaction, and increase the chemical polishing effect to make the passivation film delicate and bright.

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