Abstract
The oxidation behavior of Fe–1.5Si was investigated at 1073 and 1273 K in air, air–H2O, Ar–H2O, O2–H2O, and O2 atmospheres. The extent of corrosion in atmospheres containing H2O increased rapidly after an incubation period of slow oxidation, the incubation period becoming shorter in the order, O2–H2O, air–H2O, and Ar–H2O. With increasing H2O contents in air–H2O, the incubation time decreased. During the incubation period, oxidation was slow, because of the formation of an inner Si-rich oxide layer and a Pt marker was located between the external Fe2O3 (Fe3O4 included) and an inner Si-rich oxide layer. During the rapid oxidation, the inner FeO+Fe2SiO4 layer thickened and a Pt maker was at the interface between an external Fe-oxide and an inner FeO+Fe2SiO4 layer. Observations of scale cross sections indicated that voids made channels along the boundaries of columnar FeO crystals, suggesting transport of water molecules. The Si-rich oxide layer changed into an FeO+Fe2SiO4 mixture due to penetration of water molecules. A combined process of perforating dissociation and transport of water molecules is suggested to be the cause of the rapid growth of the inner FeO+Fe2SiO4 layer.
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Fukumoto, M., Maeda, S., Hayashi, S. et al. Effect of Water Vapor on the Oxidation Behavior of Fe–1.5Si in Air at 1073 and 1273 K. Oxidation of Metals 55, 401–422 (2001). https://doi.org/10.1023/A:1010353729663
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DOI: https://doi.org/10.1023/A:1010353729663