Phytic acid and its series products have strong chelating ability, which can form a very thin and strong organic phosphate film on the metal surface. At this point, the electrode potential of the metal has become the same as that of platinum and gold, thereby preventing the corrosion of the metal. Currently, phytic acid and its salts have been widely used in metal surface treatment. And it has been combined with other compounds to form metal surface passivators, metal surface coating agents, cyanide free electroplating additives and other products. It has played a significant role in the corrosion resistance of metals.