Study On The Ni-based Alloy Nanocrystalline Of Electrodeposition And The Microstructure And Performance

In this paper, the preparation process of electro-deposition of Ni-based alloy Nanocrystalline was optimized by using perpendicular experiments, the influence of multi-factors on the deposition process was studied, the influence of single factor on the deposition rate and the formation mechanisms were also discussed by further contrastive experiments, which will provide basis for the preparation of Ni-based alloy Nanocrystalline. At the same time, the microstructures and components of Ni-based alloy Nanocrystalline plating were characterized by EDS, XRD and SEM as well as TEM Techniques. Its performance was studied by measuring microhardness ,weight loss method, anodic polarization curve and EIS.It was indicated that the Nanocrystalline plating of Ni-W and Ni-Fe could beobtained by electro-deposition, and the sizes of crystal grains were obtained within20nm. The microhardness of Ni-W alloy is high and comes to more then 700HV.Furthermore, the microhardness of amorphous Ni-W alloy improved obviously after heattreatment. The corrosion resistance of Ni-based alloy plating is excellent. The corrosionresistance of amorphous Ni-W alloy is better then pure Ni in 3.5wt%NaCl solution;The corrosion resistance of Ni-Fe alloy is best in acid solution. The corrosion speed ofNi-W alloy drops because a surface passivation layer comes into being. In3.5wt%NaCl solution, for Ni-W alloy without exfoliation, the EIS is composed by acapacitive arc, its radius decreases rapidly with time. In final stage, the ] IS feature ofNi-W alloy is similar to that of Warburg. For Ni-Fe alloy without exfoliation, the EISis composed by a capacitive arc at high frequency and an inductive arc at lowfrequency, and the radius of capacitive arc decreases rapidly and the inductivecomponent weakens and disappears with time.