Comparison of corrosion and oxygen evolution behaviors between cast and rolled Pb–Ag–Nd anodes

Xiao-cong Zhong, Xiao-ying Yu, Zheng-wei Liu, Liang-xing Jiang, Jie Li, Ye-xiang Liu

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    Cite this article as:

    Xiao-cong Zhong, Xiao-ying Yu, Zheng-wei Liu, Liang-xing Jiang, Jie Li, and Ye-xiang Liu, Comparison of corrosion and oxygen evolution behaviors between cast and rolled Pb–Ag–Nd anodes, Int. J. Miner. Metall. Mater., 22(2015), No. 10, pp.1067-1075. https://dx.doi.org/10.1007/s12613-015-1169-9
    Xiao-cong Zhong, Xiao-ying Yu, Zheng-wei Liu, Liang-xing Jiang, Jie Li, and Ye-xiang Liu, Comparison of corrosion and oxygen evolution behaviors between cast and rolled Pb–Ag–Nd anodes, Int. J. Miner. Metall. Mater., 22(2015), No. 10, pp.1067-1075. https://dx.doi.org/10.1007/s12613-015-1169-9
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    Comparison of corrosion and oxygen evolution behaviors between cast and rolled Pb–Ag–Nd anodes

    • School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    基金项目: 

    This work was financially supported by the National Natural Science Foundation of China (Nos. 51204208 and 51374240), the Natural Science Foundation of Hunan Provincial, China (No. 13JJ1003), and the Fundamental Research Funds for the Central Universities of Central South University (No. 2014zzts028).

      通信作者:

      Liang-xing Jiang E-mail: lxjiang@csu.edu.cn

    中文摘要

    The corrosion and oxygen evolution behaviors of cast and rolled Pb–Ag–Nd anodes were investigated by metalloscopy, environmental scanning electron microscopy, X-ray diffraction analysis, and various electrochemical measurements. The rolled anode exhibits fewer interdendritic boundaries and a dispersed distribution of Pb–Ag eutectic mixtures and Nd-rich phases in its cross-section. This feature inhibits rapid interdendritic corrosion into the metallic substrate along the interdendritic boundary network. In addition, the anodic layer formed on the rolled anode is more stable toward the electrolyte than that formed on the cast anode, reducing the corrosion of the metallic substrate during current interruption. Hence, the rolled anode has a higher corrosion resistance than the cast anode. However, the rolled anode exhibits a slightly higher anodic potential than the cast anode after 72 h of galvanostatic polarization, consistent with the larger charge transfer resistance. This larger charge transfer resistance may result from the oxygen-evolution reactive sites being blocked by the adsorption of more intermediates and oxygen species at the anodic layer/electrolyte interfaces of the rolled anode than at the interfaces of cast anode.

     

    Comparison of corrosion and oxygen evolution behaviors between cast and rolled Pb–Ag–Nd anodes

    Author Affilications

      • School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    • Funds: 

      This work was financially supported by the National Natural Science Foundation of China (Nos. 51204208 and 51374240), the Natural Science Foundation of Hunan Provincial, China (No. 13JJ1003), and the Fundamental Research Funds for the Central Universities of Central South University (No. 2014zzts028).

    • Received: 02 August 2014; Revised: 22 September 2014; Accepted: 03 November 2014;
    The corrosion and oxygen evolution behaviors of cast and rolled Pb–Ag–Nd anodes were investigated by metalloscopy, environmental scanning electron microscopy, X-ray diffraction analysis, and various electrochemical measurements. The rolled anode exhibits fewer interdendritic boundaries and a dispersed distribution of Pb–Ag eutectic mixtures and Nd-rich phases in its cross-section. This feature inhibits rapid interdendritic corrosion into the metallic substrate along the interdendritic boundary network. In addition, the anodic layer formed on the rolled anode is more stable toward the electrolyte than that formed on the cast anode, reducing the corrosion of the metallic substrate during current interruption. Hence, the rolled anode has a higher corrosion resistance than the cast anode. However, the rolled anode exhibits a slightly higher anodic potential than the cast anode after 72 h of galvanostatic polarization, consistent with the larger charge transfer resistance. This larger charge transfer resistance may result from the oxygen-evolution reactive sites being blocked by the adsorption of more intermediates and oxygen species at the anodic layer/electrolyte interfaces of the rolled anode than at the interfaces of cast anode.

     

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