Effect of the Current Density on Oxygen Overpotential and Corrosion Rate of the Al/Pb-Ag-Co Anodes for Zinc Electrowinning

Abstract:

Lead-silver-cobalt was electrodeposited on the aluminum matrix, which was used as anode for zinc electrowinning. Scanning electron microscopy (SEM), linear sweep voltammetry(LSV), Tafel curve were used to study the effect of different current density on the surface morphology, electrocatalytic activity and corrosion resistance of Al/Pb-Ag-Co anode. The results showed that the Ag content change slightly with the current density change, but the Co content change big with the current density change; the value of a and b oxygen evolution of Pb-Ag-Co composite coating electrode obtained under 1 Adm-2were the smallest, respectively, was 1.436 V, 0.930 V; and the corrosion potential was 0.272 V; surface microstructure was smooth and dense.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 1718-1723
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.1718
• Online since: January 2013
• Authors: Jian Hua Liu, Bu Ming Chen, Zhong Cheng Guo, Yong Chun Zhang, Rui Dong Xu
• Keywords: Anode, Current Density, Electro-Deposition, Zinc Electrowinning

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