Effects of Current Density on Micromorphology and Property of Nickel Deposition Layer Prepared by Friction Jet Electrodeposition

The nickel deposition layer was prepared by friction jet electrodeposition system, the variation of the surface micromorphology, microstructure, average size of grain and microhardness of the nickel deposition layer as a function of current density was studied by micromorphology analysing, X-ray diffraction, microhardness testing and so on. The results show that the hard particles could effectively remove the hydrogen bubbles and nodules absorbed on nickel deposition layer surface, and obtain regular and smooth deposition layer. With the increase of the current density, the orientation degree of the lattice planes of (111), (200) and (220) converged, the surface roughness and average size of grains first decreased and then increased, the surface roughness was minimal when the current density was 80 A·dm-2, and the average size of grains, which was 9.67 nm, was minimal when the current density was 100 A·dm-2. The microhardness first increased and then decreased and it was maximal when the current density was 80 A·dm-2.