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Compositional changes in the underlying alloy produced by the oxidation of Ni-Cr alloys

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Abstract

Compositional changes in the alloy beneath scales have been examined for the oxidation of Ni-27.4%Cr and Ni-40.2% Cr in 1 atm oxygen in the temperature range 1073–1473°K. Calculations of the rate of approach of the interfacial alloy composition to a constant value are compared with experimental data. Theoretical chromium depletion profiles obtained using both a finite difference analysis and an analytical expression are shown to be essentially equivalent and in good agreement with experimental measurements. The consequences of alloy depletion for the scaling behavior, when the protective scale is ruptured, are discussed.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Glasgow, G12 8QQ, Glasgow, Scotland

    T. Hodgkiess

  2. Corrosion and Protection Centre, U.M.I.S.T., P.O. Box 88, M60 1QD, Manchester, England

    G. C. Wood & B. D. Bastow

  3. Department of Metallurgy and Materials Science, University of Liverpool, P.O. Box 147, L69 3BX, Liverpool, England

    D. P. Whittle

Authors
  1. T. Hodgkiess
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  2. G. C. Wood
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  3. D. P. Whittle
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  4. B. D. Bastow
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Hodgkiess, T., Wood, G.C., Whittle, D.P. et al. Compositional changes in the underlying alloy produced by the oxidation of Ni-Cr alloys. Oxid Met 12, 439–449 (1978). https://doi.org/10.1007/BF00612089

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  • DOI: https://doi.org/10.1007/BF00612089

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