Nickel metal has high stability in air, strong passivation ability, can form a very thin passivation film in air, can resist the corrosion of alkali and acids, so that the product is chemically stable in work and alkaline environment, not easy to discolor, can only be oxidized above 600 ℃; nickel plating layer has strong adhesion, not easy to fall off; nickel plating layer can make the surface of material harder, can improve the product wear resistance and acid and alkali corrosion resistance, the product wear resistance, corrosion, rust prevention performance is excellent.