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Oxidation of Binary FeCr Alloys (Fe–2.25Cr, Fe–10Cr, Fe–18Cr and Fe–25Cr) in O2 and in O2 + H2O Environment at 600 °C

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Abstract

The oxidation behaviour of the binary alloys Fe–2.25Cr, Fe–10Cr, Fe–18Cr and Fe–25Cr (wt%) in dry and wet O2 at 600 °C is investigated by isothermal exposures of carefully polished samples for up to 168 h. The oxidized samples are investigated gravimetrically and the oxides formed are studied by X-ray diffraction. X-ray photoelectron spectroscopy is used for depth profiling of the thin oxides. The scale surface is imaged by SEM. Cross-sections through the scale are analyzed by SEM/EDX for imaging and for measuring the chemical composition. The oxidation behavior of the four FeCr alloys is intermediate between those of iron and chromium. Fe–2.25Cr oxidizes in a way similar to iron in both environments, forming a poorly protective scale consisting of FeCr spinel at the bottom, magnetite in the middle and a hematite cap layer. In dry O2, Fe–10Cr, Fe–18Cr and Fe–25Cr form a thin and protective (Fe,Cr)2O3 oxide similar to the chromia film formed on pure chromium. In wet O2, Fe–10Cr, Fe–18Cr and Fe–25Cr initially form the same kind of protective oxide film as in dry conditions. After an incubation time that depends on alloy chromium content, all three alloys go into breakaway oxidation and form thick, poorly protective scales similar to those formed on Fe–2.25Cr. Breakaway oxidation in wet O2 is triggered by the evaporation of CrO2(OH)2 from the protective (Fe,Cr)2O3 oxide.

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Acknowledgments

This work was carried out within the Swedish High Temperature Corrosion centre (HTC) and the Swedish Foundation for Strategic Research (SSF) Materials Research Programme “Mechanisms of creep and oxidation of high performance alloys” (CROX). A grant from the Knut and Alice Wallenberg Foundation for acquiring the FEG SEM instrument is gratefully acknowledged. The authors are grateful to Samuel Hallström at the Royal Institute of Technology for carrying out the Thermo-Calc calculations.

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Authors and Affiliations

  1. Environmental Inorganic Chemistry, Department of Chemical and Biological Engineering, Chalmers University of Technology, 412 96, Göteborg, Sweden

    B. Pujilaksono, J.-E. Svensson & L.-G. Johansson

  2. Microscopy and Microanalysis Group, Department of Applied Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden

    T. Jonsson, H. Heidari & M. Halvarsson

Authors
  1. B. Pujilaksono
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  2. T. Jonsson
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  3. H. Heidari
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  4. M. Halvarsson
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  5. J.-E. Svensson
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  6. L.-G. Johansson
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Correspondence to T. Jonsson.

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Pujilaksono, B., Jonsson, T., Heidari, H. et al. Oxidation of Binary FeCr Alloys (Fe–2.25Cr, Fe–10Cr, Fe–18Cr and Fe–25Cr) in O2 and in O2 + H2O Environment at 600 °C. Oxid Met 75, 183–207 (2011). https://doi.org/10.1007/s11085-010-9229-z

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  • DOI: https://doi.org/10.1007/s11085-010-9229-z

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