Corrosion resistance and mechanical properties of pulse electrodeposited Ni-TiO_2 composite coating for sintered NdFeB magnet

摘要

Ni-TiO_2 composite coating which was prepared under pulse current conditions was successfully performed on sintered NdFeB magnet. As a comparison, pure nickel coating was also prepared. The phase structure, the surface morphology, the chemical composition, the anti-corrosion performance of the coatings for magnets, the microhardness and the wearing resistance performance of the coatings were studied using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), electrochemical technique, Vickers hardness tester and ball-on-disc tribometer, respectively. The results revealed that Ni-TiO_2 composite coating provided excellent anti-corrosion performance for the magnets, and showed higher microhardness and better anti-wear performance.