Phytic acid and its products have a strong chelating ability, in the metal surface to form a layer of very thin and strong dense organic phosphate film. At this time, the electrode potential of the metal has become the same as 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 composed of metal table in the passivation agent, metal surface coating agent, cyanide-free plating additives and other products. In the metal corrosion has played a huge role.