Electrochemical and conversion electron mössbauer study of corrosion induced by acid rain

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

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Abstract

The passivation of low carbon steel was studied in aqueous solution of 0.5M Na2SO4 +0.001M NaHSO3 (pH 3.5, 6.5 and 8.5) which can be considered as a model of acid rain. The used conversion electron Mössbauer spectroscopy (CEMS) with the complementary electrochemical investigations proved that the sulfite ions induce pitting corrosion at pH 3.5 and 6 5 while the measurements showed much weaker pitting at pH 8.5. The compositions and thicknesses of the passive films formed during the electrochemical treatments are determined from the CEM spectra. Only γ-FeOOH was found on the surface of the samples at pH 6.5 and 8.5. Nevertheless, at pH 3.5 the sextet belonging to Fe3C appears in the spectra, and also FeS04H2O could be detected in low concentration.

Original languageEnglish
Pages (from-to)20-21
Number of pages2
JournalNuclear Inst. and Methods in Physics Research, B
Volume76
Issue number1-4
DOIs
Publication statusPublished - Apr 4 1993

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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