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Yang X.K.,Chongqing University of Technology | Yang X.K.,Chongqing Engineering Research Center for Environmental Corrosion and Protection | Mu X.L.,Chongqing University of Technology | Mu X.L.,Chongqing Engineering Research Center for Environmental Corrosion and Protection | And 12 more authors.
Surface Engineering | Year: 2012

In this article, a protective Ni-Co alloy coating was prepared on AZ91D magnesium alloy which was pretreated with electroless plating. The surface morphologies, microstructure and chemical composition of the coatings were studied using environmental scanning electron microscope, Xray diffraction and energy dispersive spectroscopy respectively. The surface morphologies and microstructure analysis showed that the Ni-Co alloy coating possessed cone shaped grain congeries and formed face centred cubic solid solution. The energy dispersive spectroscopy analysis revealed that the content of cobalt element in the alloy coating was ̃31 wt-%. Potentiodynamic polarisation curves and electrochemical impedance spectroscopy were employed to investigate the corrosion resistance of different corrosive systems in neutral 3?5 wt-%NaCl and 0?5 mol L -1 Na 2SO 4 solutions, which were chosen to simulate the effects of marine and industrial environments respectively. The results showed that the corrosion resistance of the AZ91D magnesium alloy was obviously improved by the Ni-Co alloy coating. © 2012 Institute of Materials, Minerals and Mining. Source

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