Study On The Preparation And Properties Of Ni-Nano-TiO₂ Electrodeposited Coating

Ni-nano-TiO₂ electrodeposited coating was prepared by means of electrocodeposition in the nickel plating solution with nano-TiO₂. The influence of composition of solution, surfactant and experiment parameters on the properties and surface morphology of composite coating was studied. X-ray diffraction(XRD) and metalloscope were used to analyze the composition, structure and surface morphology of the composite coating.The optimized plating solution composition was summarized as follows: NiSO₄·7H₂O 240g·L^-1, MCl₂·6H₂O 40g·L^-1, H₃BO₃ 40g·L^-1, brightener 0.05⁰.1g·L^-1, nano-TiO₂ 24g·L^-1, pH 3.5 4.5. And the optimized technique condition was as the following: cationic surfactant, cathode current density 2.0³.0A·dm^-2, stir speed 675r·min^-1, plating temperature 30⁵5℃, plating duration 2³h, ultrasonic dispersion. The composite coating prepared with the above condition has high hardness, bright surface and good binding with the substrate.The experiment results showed that the composite coating prepared with cationic surfactant and ultrasonic dispersion has relative good properties. The addition of nano-TiO₂ obviously increases the hardness of...