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

页码：505 / 512

页数：8

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