Galvanized strip steel is cold rolled or hot rolled, long and narrow strip steel plate with different degrees of coating called (zinc, aluminum) raw materials. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Hot-dip galvanized strip steel substrate and molten plating solution occurs complex physical, chemical reaction, the formation of corrosion-resistant structure close zinc an iron alloy layer. The alloy layer is integrated with the pure zinc layer and the strip steel substrate. Therefore, its corrosion resistance is strong.