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Distribution and characterization of high temperature air corrosion products on iron-chromium alloys by Raman microscopy

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Abstract

Raman microscopy has been used to study the nature and distribution of corrosion products formed on iron and iron-chromium alloys in air at high temperatures. Fe and Fe-Cr alloys containing 2, 5, 14, and 18% Cr were oxidized at 400, 600, and 850°C for 2 hr, in addition samples of each alloy were oxidized for 24 hr at 400°C to obtain thicker scales at this temperature. The corroded samples showed varying distributions of the oxides Fe2O3, Fe3O4, Cr2O3, and FeCr2O4. Fe2O3 and Fe3O4 were formed exclusively on the pure iron and the 2 and 5% chromium alloys at all temperatures and on the 14% chromium alloy at 400°C. The 14 and 18% Cr alloys formed scales containing Cr2O3 and FeCr2O4 at the higher temperatures (600 and 850°C). Examples of small regions of Fe2O3 being formed within Cr2O3-FeCr2O4 scales are suggested as possible indications of breakaway corrosion initiation sites.

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Authors and Affiliations

  1. School of Chemical and Life Sciences, Newcastle-upon-Tyne Polytechnic, NE1 8ST, Newcastle-upon-Tyne, England

    Derek J. Gardiner, C. John Littleton & Kenneth N. Strafford

  2. British Gas Corporation, London Research Station, Michael Road, SW6 2AD, London, England

    K. Mark Thomas

Authors
  1. Derek J. Gardiner
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  2. C. John Littleton
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  3. K. Mark Thomas
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  4. Kenneth N. Strafford
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Gardiner, D.J., Littleton, C.J., Thomas, K.M. et al. Distribution and characterization of high temperature air corrosion products on iron-chromium alloys by Raman microscopy. Oxid Met 27, 57–72 (1987). https://doi.org/10.1007/BF00656729

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  • DOI: https://doi.org/10.1007/BF00656729

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