Preparation and corrosion resistance of Ni-W-ZrO₂ composite coatings by electrodeposition

The Ni-W-ZrO₂ composite coatings were prepared by electrodeposition. The dispersible characteristics of particles were studied. The effects of the main factors, such as adding particle quantity, current density, pH value and temperature on the hardness, deposition rate and surface of Ni-W-ZrO₂ composite coatings were investigated. The process parameters of Ni-W-ZrO₂ composite coatings were obtained through optimization: the adding particle quantity is 10 g/L, current density is 15 A/dm², pH value is 7 and temperature is 60~70 ℃. The microhardness of Ni-W-ZrO₂ coatings reaches higher than HV800(×9.8MPa). The corrosion resistance was studied by the electrochemical techniques, and the results show that the Ni-W-ZrO₂ composite coatings have obvious passivation.