Electrodeposition and Hardness and Corrosion Resistance Propertie of Ni/Nano-B4C Composite Coatings

Ji Bo Jiang; Wei Dong Liu; Lei Zhang; Qing Dong Zhong; Yi Wang; Qiong Yu Zhou

doi:10.4028/www.scientific.net/AMR.399-401.2055

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Electrodeposition and Hardness and Corrosion Resistance Propertie of Ni/Nano-B₄C Composite Coatings

Abstract:

Ni–B₄C composite coatings on carbon steel substrates with various contents of B₄C nano-particulates were prepared by electrodeposition in Ni plating bath containing B4C nano-particulates. Microhardness, Scanning Electron Microscopy (SEM), Tafel polarization and Electrochemical Impedance Spectroscopy (EIS) measurements were used to compare pure nickel coatings and Ni–B₄C composite coatings. Pure Ni coating microhardness is lower than that of Ni–B₄C coatings and the microhardness of the composite coatings increases with the increase of the content of B₄C nano-particulates. The effects of various contents of B₄C nano-particulates on the corrosion resistance were investigated and it was found that the best anti–corrosion property of Ni–B₄C composite coatings is at 6 g/L B₄C in the bath formulation.