Galvanized strip is a long and narrow strip of cold-rolled or hot-rolled steel which is coated with a layer of raw material called zinc and aluminium in varying degrees. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions occur between hot-dip galvanized strip steel matrix and molten plating solution, forming a zinc-iron alloy layer with a close corrosion-resistant structure. The alloy layer is integrated with pure zinc layer and strip steel matrix. Therefore, it has strong corrosion resistance.