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What is Chrome Passivation of Galvanized Sheet
Passivated galvanized steel plate and non-passivated galvanized steel plate to see the color, if there is no obvious experimental phenomenon, look for magnifying glass to observe the steel plate table is presented, there are large white oxidized particulate matter is passivated, not passivated surface has white floating soil ash.
The passivation of the surface of hot galvanized sheet is mainly to prevent the surface from being oxidized in the process of using. Due to the existence of passivation film on the surface, the phosphating process cannot be carried out, which affects the adhesion of coating after painting (chromate passivation film is not as good as the adhesion of phosphating film) and corrosion resistance (chromium ion is not resistant to the corrosion of chloride ion). In order to improve the coating performance after passivation, a phosphating process suitable for the above conditions was developed.
The zinc-plated steel plate can be divided into general use, roof use, building the outer board with, structure with, tile ridge board with, stretch with and deep drawing with galvanized steel sheet.