Abstract
Structural Fe-Cr-Ni alloys may be rapidly degraded in oxygen-sulfur mixed-gas environments at elevated temperatures unless protective oxide scales can be formed and maintained. The breakaway corrosion process was examined in model alloys of Fe-25wt.% Cr-20wt.% Ni with and without Nb and Zr additions. Oxide scales were preformed in S-free environments and subsequently exposed to oxygen-sulfur mixed-gas atmospheres. Preformed scales were found to delay the onset of breakaway corrosion. The beneficial effects of refractory metal additions were achieved via formation of a barrier layer at the Cr2O3 alloy interface.
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Baxter, D.J., Natesan, K. Breakdown of chromium oxide scales in sulfur-containing environments at elevated temperatures. Oxid Met 31, 305–323 (1989). https://doi.org/10.1007/BF00846691
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DOI: https://doi.org/10.1007/BF00846691