Corrosion Resistance of Ni-Al₂O₃ Nano-composite Coatings Prepared by Electrophoretic-electrochemical Deposition

Ni-Al2O3 nano composite coatings with high concentration of Al2O3 nano particles were prepared by electrophoretic/DC electrodeposition and electrophoretic/pulse electrodeposition. The effects of Al2O3 concentration on the surface morphology and microstructure of the nano-composite coatings were analyzed. The corrosion resistance of the Ni-Al2O3 nano-composite coatings was studied in 10% HCl and 10% H2SO4 solutions respectively by static immersion method. The results showed that the nano-composite coating had a smooth surface with compact and uniform microstructure, the corrosion resistance of the nano-composite coatings was better than that of pure Ni coating.