Abstract
The passivation of low carbon steel was studied in aqueous solution of 0.5 M Na2SO4+0.001 M NaHSO3 at pH=3.5 and 6.5. The found major components at pH-3.5 were: γ-FeOOH and Fe3C, and also FeSO4.H2O could be identified on the surface of the low carbon steel as a minor component. At pH-6.5, the passive film contained only amorphous iron(III)-oxide or oxyhydroxide.
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Vértes, C., Lakatos-Varsányi, M., Vértes, A. et al. conversion electron Mössbauer study of low carbon steel polarized in aqueous sulfate solution containing sulfite in low concentration. Hyperfine Interact 69, 731–734 (1992). https://doi.org/10.1007/BF02401930
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DOI: https://doi.org/10.1007/BF02401930