Galvalume plate refers to steel plate coating with aluminum (passivation protection) added on the basis of zinc. The general composition is 55% aluminum, 43.5% zinc, 1.5% silicon. It has excellent atmospheric corrosion resistance. The corrosion resistance is galvanized plate. It also has the high temperature corrosion resistance of aluminum plate, smooth surface and good appearance, but its coating has slightly poorer forming and welding resistance.