PREPARATION AND INVESTIGATION OF ELECTRODEPOSITED Ni–NANO-Cr2O3 COMPOSITE COATINGS

Jibo Jiang, Chenqi Feng, Wei Qian, Libin Yu, Fengying Ye, Qingdong Zhong and Sheng Han
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Jibo Jiang: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, P. R. China
Chenqi Feng: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, P. R. China
Wei Qian: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, P. R. China
Libin Yu: #x2020;Shanghai ZhenHua Heavy Industry Co., LTD 200120, P. R. China
Fengying Ye: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, P. R. China
Qingdong Zhong: #x2021;Shanghai Key Laboratory of Modern Metallurgy and Material Processing, Shanghai University, Shanghai 200072, P. R. China
Sheng Han: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, P. R. China

Surface Review and Letters (SRL), 2016, vol. 23, issue 02, 1-11

Abstract: The electrodeposition of Ni–nano-Cr2O3 composite coatings was studied in electrolyte containing different contents of Cr2O3 nanoparticles (Cr2O3 NPs) on mild steel surfaces. Some techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness, the potentiodynamic polarization curves (Tafel) and electrochemical impedance spectroscopy (EIS) were used to compare pure Ni coatings and Ni–nano-Cr2O3 composite coatings. The results show that the incorporation of Cr2O3 NPs resulted in an increase of hardness and corrosion resistance, and the maximum microhardness of Ni-nano-Cr2O3 composite coatings reaches about 495 HV. The coatings exhibit an active-passive transition and relatively large impedance values. Moreover, the effect of Cr2O3 NPs on Ni electrocrystallization is also investigated by cyclic voltammetry (CV) and EIS spectroscopy, which demonstrates that the nature of Ni-based composite coatings changes attributes to Cr2O3 NPs by offering more nucleation sites and less charge transfer resistance.

Keywords: Electrodeposition; corrosion resistance; cyclic voltammetry; Tafel polarization; EIS spectroscopy (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X15501115

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