Phytic acid and its series products have a strong chelating ability and can form a very thin and solid organic phosphating film on the surface of the metal. At this time, the electrode potential of the metal has become the same as that of platinum and gold, thus preventing the corrosion of the metal. Phytic acid and its salts have been widely used in metal surface treatment. And with other compounds to form the metal table passivation agent, metal surface coating agent, non-cyanide plating additives and other products. It plays a huge role in metal corrosion resistance.