Effect of nano-TiC concentration on structure and properties of Ni-TiC composite coatings prepared by double pulse electrodeposition
Effect of nano-TiC concentration in the plating solution on structure and properties of double pulse electrodeposited Ni-TiC composite coatings was studied.Surface morphology and phase of the composite coatings were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD),and the surface roughness,microhardness,wear resistance and corrosion resistance of the coatings were studied.The results show that when the concentration of nano-TiC in the plating solution is low,the composite coatings exhibit a cellular deposition structure similar to that of pure Ni coating.When the concentration of nano-TiC in the plating solution is high,the composite coatings exhibit a cauliflower like deposition structure.When the concentration of nano-TiC is 8 g/L,the surface density of the coating is relatively high,and the diffraction peak of Ni shows a significant broadening phenomenon.With the increase of nano-TiC concentration in the plating solution,the wear mass loss ratio of the composite coatings shows a trend of first decreasing and then increasing.When the nano-TiC concentration is 8 g/L,the wear mass loss ratio is the smallest,which is 5.436％.When the concentration of nano-TiC in the plating solution is 8 g/L,the self corrosion current density of the coating is the lowest and the polarization resistance value is the highest.The results show that the optimal concentration of nano-TiC in the plating solution for preparing Ni-TiC composite coating by double pulse electrodeposition is 8 g/L.
double pulse electrodepositionnano-TiCnickel base composite coatingmicrostructureproperty
NETL
NSTL
万方数据
