Corrosion behavior of nickel base alloy coatings in the winter precipitation contamination of Chinese north old industrial city

In order to study the corrosion behavior of nickel-based alloy coatings in the winter precipitation of Chinese north old industrial city,Ni-P and Ni-Fe coatings were prepared by electrodeposition,and the phase structure and corrosion resistance of the nickel coatings were examined.Experimental results show that the corrosion resistances of different nickel coatings are different.The Ni-Fe coating has a nobler potential,a lower corrosion current density and a better corrosion resistance.Its corrosion rate is about half of 20 Steel's one.This is because that Fe in the nickel coating has a greater affinity with oxygen and can form a continuous oxide film quickly on the surface of the Ni-Fe coating.But the oxide film on the Ni-P coating forms slowly and its impedance resistance is lower than that of the Ni-Fe coating.Thus the Ni-P coating is not suitable to be used for outdoor decoration and corrosion protection in Chinese north old industrial city.