Novel application of radiotracer techniques for corrosion studies of zinc and aluminium in acidic medium

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Abstract

The adsorption of sulphate ions on Zn and Al was studied in 0.5 M NaClO4 supporting electrolyte at various pH values in the range of pH = 2-7 by radiotracer techniques. It was found in both cases that the adsorption of sulphate passes over maximum in the pH range studied. The phenomena observed are interpreted by the assumption that the main component of the overall process is anion adsorption on the protonated oxides/hydroxides formed as a result of corrosion. At low pH values the steady state coverage with respect to these products should be very low owing to their dissolution; consequently the extent of anioni adsorption induced must also be very low. At higher pH values where no protonation occurs the adsorption of anions decreases significantly.

Original languageEnglish
Pages (from-to)899-907
Number of pages9
JournalCorrosion Science
Volume44
Issue number5
DOIs
Publication statusPublished - May 1 2002

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Keywords

  • Adsorption of anions
  • Corrosion process
  • Radioatracer study
  • pH effect

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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