Microstructure and performance of electrodeposited nanocrystalline Ni-W alloys
(1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China2.湖南城市学院 土木工程学院，湖南 益阳，413000)
Abstract: The electro-deposition method was used for preparation of nanocrystalline Ni-W alloys coating. The formation, microstructure and performance of the nanocrystalline were investigated. X-ray diffraction results show that Ni-W alloys are crystallized in scale of 1730nm. Changing with the depositional time, the coating varies with different surface morphology. The observation on the formation of the coating implies that, the alloys preferentially deposit and grow on the scratch and corrosion pit edges. The hardness of the alloy coatings is related to the solution composition, pH value and current density, and the pH value and current density are mainly concerned. The corrosion resistance of Ni-W alloy coating is excellent compared with that of Cr and Ni coatings.
Key words: electro-deposition； nanocrystalline Ni-W alloy； surface morphology； micro-hardness； corrosion resistance