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Influence of Pre-oxidation on the Corrosion and Mechanical Strength of Fe–25Cr and Fe–25Cr–20Ni Alloys at 973 K

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Abstract

The influence of pre-oxidation on the corrosion and mechanical strength of Fe–25Cr and Fe–25Cr–20Ni alloys was investigated in N2–0.1SO2 at 973 K with and without mechanical loadings. About 0.1μm-thick Cr2O3 scales formed on the Fe–25Cr alloy by pre-oxidation in Ar. However, spinel oxides of (Fe,Cr)3O4 remained on the Cr2O3 and voids formed at the oxide/metal interface on Fe–25Cr–20Ni after pre-oxidation in Ar. The preformed oxides are very effective in preventing corrosion of the alloy surfaces. The preformed oxides are also beneficial to increase the strength of the alloys in corrosive environments. The effects of pre-oxidation on Fe–25Cr are stronger than those of Fe–25Cr–20Ni due to the different characteristics of the preformed oxides.

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Correspondence to Il Ryoung Sohn.

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Sohn, I.R., Narita, T. Influence of Pre-oxidation on the Corrosion and Mechanical Strength of Fe–25Cr and Fe–25Cr–20Ni Alloys at 973 K. Oxid Met 65, 181–194 (2006). https://doi.org/10.1007/s11085-006-9011-4

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  • DOI: https://doi.org/10.1007/s11085-006-9011-4

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