The surface of the galvalume steel plate is a unique smooth and flat star flower, the basic color is silver, and the coating is composed of 55% aluminum, 43.4% zinc and 1.6% silicon, which are dried at a high temperature of 600 ° C to establish a high-density quaternary Crystals, eventually forming a strong and effective natural barrier to prevent the penetration of corrosion factors.

The corrosion resistance of galvalume mainly comes from the barrier protection function of aluminum and the sacrificial protection function of zinc. When zinc is used for sacrificial protection in trimming, scratches and scratches of the coating, aluminum will produce an insoluble metal oxide layer, giving full play to the role of natural barrier protection.