Electrochemical properties of Pb-Sb, Pb-Ca-Sn and Pb-Co3O4 anodes in copper electrowinning

被引：29
|
作者：
Hrussanova, A [1 ]
Mirkova, L [1 ]
Dobrev, T [1 ]
机构：
[1] Bulgarian Acad Sci, Inst Phys Chem, Dept Elchim, BU-1113 Sofia, Bulgaria
来源：
JOURNAL OF APPLIED ELECTROCHEMISTRY | 2002年 / 32卷 / 05期
关键词：
composite Pb-Co coating; copper electrowinning; Pb-Sb anode; Pb-Sn-Ca anode;
D O I：
10.1023/A:1016591810240
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Three types of anode, Pb-Sb, Pb-Ca-Sn and Pb-Co3O4, for copper electrowinning were investigated. The corrosion resistance, as evaluated by cyclic voltammetric (CV) measurements was higher for Pb-Co3O4 than for Pb-Sb and Pb-Ca-Sn. During prolonged electrowinning under galvanostatic conditions, the anodic reaction on the Pb-Co3O4 anode was depolarized by 0.053 V as compared to Pb-Sb, and by 0.106 V with respect to Pb-Ca-Sn. The composition and structure of the anodic layer were determined by XPS, X-ray and SEM analyses. The surface layer on the three anodes examined was composed mainly of PbSO4, alpha-PbO2 and beta-PbO2. Different structure of the surface layer was observed: loose and highly spread coral-like structure in the case of Pb-Sb; fibrous structure in the case of Pb-Ca-Sn and dense, fine-grained structure in the case of Pb-Co3O4.
引用
收藏
页码：505 / 512
页数：8
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