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Journal of Applied Electrochemistry

, Volume 22, Issue 7, pp 606–612 | Cite as

The degradation of aluminium cathodes by fluoride ion during zinc electrowinning

  • J. S. Han
  • T. J. O'Keefe
Papers

Abstract

The influence of fluoride ions on aluminium cathode surface degradation during zinc electrowinning has been studied. Electrolyte with a composition similar to that employed in plant operations has been used. A direct correlation is shown between the electrolyte fluoride content and the number of deposition cycles possible before zinc removal becomes difficult. The role of initial nucleation and starting electrode morphology is discussed in terms of the degree of adherence observed. Electrochemical tests have also been made on the electrodes at various stages of the process in an attempt to gain a better fundamental understanding of the mechanisms responsible for the adherence. The results indicate that the severity, of the adherence is generally determined by the amount of residual zinc remaining on the surface after stripping and the fluoride content of the solution during plating. The contribution of physical surface condition alone seems to be less significant than the chemical conditions imposed during deposition.

Keywords

Zinc Fluoride Surface Condition Chemical Condition Cathode Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • J. S. Han
    • 1
  • T. J. O'Keefe
    • 1
  1. 1.Department of Metallurgical Engineering and Graduate Centre for Materials ResearchUniversity of Missouri-RollaRollaUSA

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