Abstract
Model alloys Fe–20Cr and Fe–20Cr–20Ni, with and without Si additions (0.1, 0.2 and 0.5 wt%), were exposed to Ar–20CO2–20H2O gas at 818 °C. All undoped alloys underwent breakaway corrosion, resulting in iron-rich oxide scales and internal carbide precipitates. Silicon addition significantly improved both oxidation and carburization resistance in wet CO2, by forming a layer of silica beneath the chromia scale. Silicon-bearing austenitic alloys underwent scale spallation on cooling from reaction. The contributions of thermal and growth stresses to spallation, and of growth stresses to the onset of breakaway are discussed.
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Financial support from the Australian Research Council’s Discovery Program is gratefully acknowledged.
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Nguyen, T.D., Zhang, J. & Young, D.J. Water Vapor Effects on Corrosion of Fe–Cr and Fe–Cr–Ni Alloys Containing Silicon in CO2 Gas at 818 °C. Oxid Met 83, 575–594 (2015). https://doi.org/10.1007/s11085-015-9536-5
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DOI: https://doi.org/10.1007/s11085-015-9536-5