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Journal of Chemistry
Volume 2013 (2013), Article ID 538462, 5 pages
Research Article

Lead-Silver Anode Degradation during Zinc Electrorecovery Process: Chloride Effect and Localized Damage

1Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
2Center of Climate Changes and Global Warming (CCCGW), Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran

Received 4 May 2013; Revised 1 September 2013; Accepted 18 September 2013

Academic Editor: Aicheng Chen

Copyright © 2013 Mohsen Lashgari and Farzaneh Hosseini. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Using mass-loss, potentiodynamic polarization, and electrochemical impedance measurements under anodic regime, the corrosion behaviour of lead-silver (0.55%) electrode in zinc electrowinning solution containing different concentration of chloride anions was studied. The results revealed that the rate of corrosion does not monotonically increase with concentration. Moreover, the maximum degradation occurs at the concentration where the anodic process (oxygen evolution) proceeds hardly. According to polarization curves, the electrode exhibited obvious electrocatalytic activity (for anode reaction) by forming oxide layer. To scrutinize the localized damage, occurring at the bottom of anode, we also took some scanning electron micrographs with energy dispersive X-ray analyses. The investigations suggested a new mechanism, that is, a complicated migration phenomenon, resulting from an electrodissolution/sedimentation/deposition process.