Influence of Impressed D.C. Currents and Short-Circuiting on the Oxidation of Iron to W&uuml;stite in CO&ndash;CO<SUB>2</SUB> Gas Mixtures at 973 to 1123 K

DOI Web Site 被引用文献1件 参考文献24件
  • Ananth V.
    Department of Metallurgical Engineering, Indian Institute of Technology
  • Sircar S. C.
    Department of Metallurgical Engineering, Indian Institute of Technology
  • Bose S. K.
    Department of Metallurgical Engineering, Indian Institute of Technology

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  • Influence of Impressed D.C. Currents and Short-Circuiting on the Oxidation of Iron to Wüstite in CO–CO<SUB>2</SUB> Gas Mixtures at 973 to 1123 K

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The present study reports the results of investigation on the effects of impressed d.c. current on the growth of FeO layer on iron. The atmosphere and the temperature range of study chosen were CO–CO2 gas mixtures and from 973 to 1123 K. Except for the initial part, the kinetics of FeO layer growth under normal oxidation, under impressed current of both the polarities and under short-circuited condition followed the parabolic growth law. Under cathodic condition of the sample as well as under short-circuited condition, the rates were found to be more than that under normal oxidation condition. Decrease in oxidation rate was observed during the later part of oxidation, when the iron sample was made anodic. However, at lower temperatures, 973 K and 1023 K, the rates were found to be more than that under normal oxidation condition. The results have been qualitatively interpreted on the basis of expected changes in situations with regard to defect concentrations at the metal/oxide and oxide/gas interfaces as well as on the basis of changed transport coefficient of defects through the FeO layer. A thermogravimetric method was employed for following up the kinetics. A new method of field application was used.

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