Electrochemical studies of the performance of different Pb-Ag anodes during and after zinc electrowinning

被引:62
作者
Zhang, W. [1 ]
Houlachi, G. [2 ]
机构
[1] Univ Laval, Dept Min Met & Mat Engn, Quebec City, PQ G1K 7P4, Canada
[2] Hydro Quebec Res Inst, Shawinigan, PQ G9N 7N5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Pb-Ag anode; Electrochemical methods; Acid zinc sulphate electrolyte; Corrosion behaviour; Overpotential; MnSO(4) addition; LEAD; CORROSION; COBALT;
D O I
10.1016/j.hydromet.2010.05.007
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
One Pb-0.25%Ag-0.1%Ca alloy anode and three commercial Pb-0.6%Ag, Pb-0.58%Ag and Pb-0.69%Ag alloys anodes have been studied by conventional electrochemical methods and electrochemical impedance spectroscopy (EIS) in acid zinc sulphate electrolyte with and without MnSO(4) additions to evaluate their activity and corrosion behaviour. At a current density of 50 m Acm(-2) and 38 degrees C, the polished surface of the anode Pb-0.69%Ag alloy had the lowest overpotential, followed closely by that of anodes Pb-0.6%Ag and Pb-0.58%Ag alloys and then anode Pb-0.25%Ag-0.1%Ca alloy in a bath with and without MnSO4 additions. Also, during potential decay period after 5 h electrolysis, the polished surfaces showed that anode Pb-0.69%Ag alloy had the lowest corrosion current among the four examined anodes, followed by anodes Pb-0.6%Ag. Pb-0.25%Ag-0.1%Ca alloys and Pb-0.58%Ag alloy. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:129 / 135
页数:7
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