Optimization of Parameters for Brush Plating of Nanometer TiO,-Ni and Properties of the Coating

Nano-TiO(2)/Ni composite coating was prepared by brush plating. The influence of nano-TiO(2) content in plating solution as well as voltage and initial temperature of the plating solution on the properties of TiO(2)-Ni coating was studied by orthogonal test. The adhesion strength of as-obtained nano-TiO(2)/Ni composite coating to Ti alloy substrate was qualitatively evaluated based on filing test, shock-cooling and shock-heating test, and scratch test. The morphology and composition of the composite coating were analyzed by means of scanning electron microscopy and energy dispersive spectrometry. Results show that the content of nano-TiO(2) in the plating solution and brush electroplating voltage have significant effects on the properties of the coating, while the initial temperature of plating bath has minor effect. The composite coating obtained at voltage of 10 V, nano-TiO(2) content of 10 g/L and bath temperature of 30 degree C possessed the highest hardness and best corrosion resistance as well as good a