A Mössbauer spectroscopic study of rust formed during simulated atmospheric corrosion |
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Authors: | Henry Leidheiser Ilona Czakó-Nagy |
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Affiliation: | Department of Chemistry and Center for Surface and Coatings Research, Lehigh University, Bethlehem, Pennsylvania, U.S.A. |
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Abstract: | Steel coupons were subjected to 100% relative humidity and were inoculated every day with 100 μl of 0.01 N solutions of NaCl, Na2SO4, LiCl or CsCl. The first solid rust constituent that formed contained significant amounts of both γ-FeOOH and ferrihydrite. In contrast, only γ-FeOOH was observed in the rust formed during atmospheric corrosion and during wet-dry cycling with distilled water in the laboratory. The ferrihydrite in time was converted to γ-FeOOH, α-FeOOH, and γ-Fe2O3. The fractions of ferrihydrite + γ-FeOOH in the rust formed as a function of time during atmospheric exposure and during rusting in the laboratory environment were the same in the two cases. |
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