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The Inhibitive Effect of Traces of SO2 on the Oxidation of Iron

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Abstract

The oxidation of Fe was investigated at 500–700°C in the presence of O2 with 0–1000 ppm SO2. The exposures were carried out in a thermobalance and lasted for 24 h. The oxidized samples were investigated by grazing-angle XRD, SEM/EDX, GDOES and XPS. The rate of oxidation of pure iron is slowed down by traces of O2 in O2 below 600°C while SO2 has no effect on oxidation rate at higher temperatures. Exposure to SO2<600°C resulted in the formation of small amounts of sulfate at the gas/oxide interface. In addition, sulfur, probably sulfide, accumulated at the metal/oxide interface. The influence of SO2 on oxidation rate is attributed to surface sulfate. The sulfur distribution in the scale is rationalized in terms of the thermodynamic stability of compounds in the Fe–O–S system. Exposure to SO2 caused the formation of hematite whiskers.

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Authors and Affiliations

  1. High Temperature Corrosion Center (HTC), Chalmers University of Technology, S-412 96, Göteborg, Sweden

    A. Järdnäs, J.-E. Svensson & L.-G. Johansson

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  1. A. Järdnäs
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  2. J.-E. Svensson
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  3. L.-G. Johansson
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Järdnäs, A., Svensson, JE. & Johansson, LG. The Inhibitive Effect of Traces of SO2 on the Oxidation of Iron. Oxidation of Metals 60, 427–445 (2003). https://doi.org/10.1023/A:1027382702616

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