Conversion electron Mössbauer study of low carbon steel polarized in aqueous sulfate and sulfite containing sulfate solutions

Cs Vértes, M. Lakatos-Varsányi, W. Meisel, A. Vértes, P. Gütlich, L. Kiss

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The passivation of low carbon steel was studied in aqueous solutions of 0.5 M Na2SO4 (pH = 3.5 and 6.5) and of 0.5 M Na2SO4 + 0.001 M NaHSO3 (pH 3.5 and 6.5). The used conversion electron Mössbauer spectroscopy (CEMS) with the complementary electrochemical, microscopic and spectrophotometric investigations proved that the presence of sulfite ion induces pitting corrosion. The compositions and thichnesses of the passive films formed during the electrochemical treatments are determined from the conversion electron Mössbauer spectra. γ-FeOOH was found in each case as a major component. At pH = 3.5, the sextet belonging to Fe3C appears in the spectra in most cases, and also FeSO4 · H2O and could be detected after the shortest (90 min) polarization time.

Original languageEnglish
Pages (from-to)253-256
Number of pages4
JournalElectrochimica Acta
Volume38
Issue number2-3
DOIs
Publication statusPublished - Feb 1993

Keywords

  • acid rain.
  • conversion electron Kössbauer spectroscopy
  • pitting corrosion

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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