Abstract
The “kinetic boundary” for the oxidation of an Fe-25Cr-10Al alloy (where the composition is in approximate weight per cent) in H 2-H 2O-H 2S gas mixtures at 900°C has been measured. The kinetic boundary occurs at much lower P H2O/ P H2S ratios in the gas phase than for an Fe-25Cr binary alloy ( P H2O/ P H2S reduced from about 50 to about 7). The shift in the boundary is attributed to an enrichment of sulfide nuclei, formed in the early stages of reaction, with aluminum, at the expense of iron. This enhances the overgrowth of metastable sulfide nuclei with oxide at a given P H2O/ P H2S ratio.
Published Version
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