Corrosion resistance of Ni coating prepared by mechanical attrition(MA)-assisted electroplating
A continuous and dense nickel coating was prepared on the surface of carbon steel using mechanical attrition(MA)-assisted direct current electroplating method.Morphology,microstructure and roughness of the coating were studied by means of field emission scanning electron microscopy,transmission electron microscopy,energy dispersive spectrometer,X-ray diffraction and atomic force microscopy.Hardness and friction coefficient of the coating were tested by Vickers hardness tester and friction and wear tester.The Tafel dynamic polarization curve and electrochemical impedance test were used to compare the corrosion resistance of MA-assisted electroplating coating and the coating without mechanical attrition.The results show that compared with traditional electroplating coating,the Ni coating prepared by MA-assisted electroplating has a nanoscale fine crystal structure,smoother surface,higher hardness,and lower friction coefficient,which increases by 1 times and decreases by 11.8％respectively compared to the traditional coating.The polarization curves and electrochemical impedance spectra show that the nanocrystalline Ni coating has a lower corrosion current density,a larger capacitance arc,and a higher impedance modulus,indicating that MA-assisted electroplated Ni coating has higher corrosion resistance.
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