Abstract
Model alloys, Fe–20Cr and Fe–20Cr–20Ni without and with Si (0.1, 0.2 and 0.5 wt%), were exposed to Ar–20CO2 and Ar–20CO2–20H2O gases at 650 °C. The undoped alloys underwent breakaway corrosion in both gases, forming iron-rich oxide scales and internal carbide precipitates. Silicon additions markedly improved oxidation and carburization resistance of alloys in both gases by forming a duplex scale of chromia and silica layers. Chromia scales formed in wet gas were extremely fine-grained, but grew slower in wet gas than in dry. Selective oxidation of chromium and silicon is discussed in terms of diffusion theory.
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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. Effects of Silicon and Water Vapour on Corrosion of Fe–20Cr and Fe–20Cr–20Ni Alloys in CO2 at 650 °C. Oxid Met 87, 541–573 (2017). https://doi.org/10.1007/s11085-016-9681-5
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DOI: https://doi.org/10.1007/s11085-016-9681-5