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Anodic behavior and microstructure of Al/Pb-Ag-Co anode during zinc electrowinning

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Abstract

In order to study the anodic behavior and microstructures of Al/Pb-Ag-Co anode during zinc electrowinning, by means of potentiodynamic investigations, scanning electron microscopy (SEM) and X-ray diffraction(XRD)analyses, the mechanism of the anodic processes playing on the surface of Al/Pb-0.8%Ag and Al/Pb-0.75%Ag-0.03%Co anodes prepared by electro-deposition from methyl sulfonic acid bath for zinc electrowinning from model sulphate electrolytes have been measured. On the basis of the cyclic voltammograms obtained, information about the corrosion rate of the composite in PbO2 region has been concluded. The microstructures were also observed by means of SEM and XRD which showed Pb-0.75%Ag-0.03%Co alloy composite coating has uniform and chaotic orientation tetragonal symmetry crystallites of PbSO4, but Pb-0.8%Ag alloy composite coating has well-organized orientation crystallites of PbSO4 concentrated in the certain zones after 24 h of anodic polarization. It is important that Al/Pb-0.75%Ag-0.03%Co anode oxide film consists of non-conductive dense MnO2 and PbSO4 and α, β-PbO2 penetrated into which, in fact, are the active centers of the oxygen evolution after 24 h of anodic polarization.

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Authors and Affiliations

  1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Yong-chun Zhang  (张永春), Bu-ming Chen  (陈步明), Hai-tao Yang  (杨海涛), Hui Huang  (黄惠) & Zhong-cheng Guo  (郭忠诚)

  2. Kunming Hendera Science and Technology Co. Ltd, Kunming, 650106, China

    Zhong-cheng Guo  (郭忠诚)

Authors
  1. Yong-chun Zhang  (张永春)
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  2. Bu-ming Chen  (陈步明)
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  3. Hai-tao Yang  (杨海涛)
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  4. Hui Huang  (黄惠)
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  5. Zhong-cheng Guo  (郭忠诚)
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Correspondence to Zhong-cheng Guo  (郭忠诚).

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Foundation item: Project(51004056) supported by the National Natural Science Foundation of China

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Zhang, Yc., Chen, Bm., Yang, Ht. et al. Anodic behavior and microstructure of Al/Pb-Ag-Co anode during zinc electrowinning. J. Cent. South Univ. 21, 83–88 (2014). https://doi.org/10.1007/s11771-014-1919-2

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  • DOI: https://doi.org/10.1007/s11771-014-1919-2

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