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| ELECTROCHEMICAL BEHAVIORS OF ZINC–INDIUM ALLOY ELECTROPLATING IN ALKALINE SOLUTIONS |
| ZHOU Hebing 1,2,3, LIANG Man 2,3, L¨U Dongsheng 2,3, XU Mengqing 2,3, LI Weishan 1,2,3 |
1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641
2. Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education),South China Normal University, Guangzhou 510631
3. Key Laboratory of Electrochemical Technology on Energy Storage and Power Generation of Guangdong Higher Education Institutes, South China Normal University, Guangzhou 510631 |
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Cite this article:
ZHOU Hebing LIANG Man Lü Dongsheng XU Mengqing LI Weishan. ELECTROCHEMICAL BEHAVIORS OF ZINC–INDIUM ALLOY ELECTROPLATING IN ALKALINE SOLUTIONS. Acta Metall Sin, 2011, 47(8): 1055-1060.
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Abstract Zinc–indium alloy electrodes based on nickel substrate were prepared by a simple electroplating technique. The content of indium element in zinc–indium alloy became higher with increase in electroplating time. The effects of indium in zinc–indium alloy coating with different electroplating times on the electrochemical behaviors of zinc in alkaline solutions were investigated by inductively coupled ICP, SEM, EDS, LPS, CV and EIS. The results showed that ten minutes was the best electroplating time among the investigated electroplating times. At the plating time of ten minutes, uniform and smooth Zn–In alloy coating could be formed on the surface of nickel substrate. However, as electroplating time went on the uniformity and homogeneity of Zn–In alloy coating became much poorer because of the formation of the local large indium particles resulting from the priority growth. The electrochemical measurements showed that indium in zinc–indium alloy coating could enhance the overpotential of hydrogen evolution and the anodic dissolution resistance of zinc. This means that indium could inhibit effectively the conjugated reaction of zinc corrosion in alkaline electrolyte. Besides, indium could provide the skeleton support when zinc–indium alloy dissolved in alkaline solution. The skeleton support offered the path for OH− species passing through the surface layer of zinc–indium alloy to react with zinc in alloy inner. These effects made the passivation potential of zinc in alkaline solution shifted in positive direction. Indium could also broaden the potential region for the active dissolution of zinc and postpone the passivation of zinc. The depth of discharge of zinc in alkaline electrolyte could be improved in the presence of indium in zinc–indium alloy coating with appropriate content. Accordingly, the discharge capacity of zinc in alkaline electrolyte could be raised to a certain degree. The indium with appropriate contents in Zn–In alloy coating could favor the reduction of zinc oxide products. The charge–discharge performance of zinc could also be improved to a great extent.
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Received: 21 February 2011
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| Fund: Supported by Guangdong Natural Science Foundation (Nos.10351063101000001 and 10451063101006346) |
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