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Kinetics of Oxidation of Fe–6Si

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Abstract

Surface oxidation of Fe–6Si during annealing in low-pressure air (∼104 Pa) in the temperature range 500–550 °C was investigated using resistivity measurements, Mössbauer spectroscopy, X-ray diffraction and scanning-electron microscopy (SEM). The time dependence of the resistivity exhibits an increase in two steps, which indicates changes in the structure and/or phase composition of the alloy. Structure and phase investigations show that the first step can be explained as formation of hematite (α-Fe2O3) and the second step is due to transformation of the hematite to magnetite (Fe3O4). The kinetics of the transformations were derived from the resistivity data. The activation energies (estimated from Arrhenius plots) of 194 kJ/mol and 165 kJ/mol were obtained for the formation of hematite and transformation of hematite to magnetite, respectively.

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Acknowledgement

This work was supported by the Grant Agency of the Academy of Sciences of the Czech Republic No. IAA1041404.

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Authors and Affiliations

  1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, 616 62, Brno, Czech Republic

    A. R. Lashin, O. Schneeweiss & M. Svoboda

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  1. A. R. Lashin
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  2. O. Schneeweiss
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  3. M. Svoboda
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Correspondence to A. R. Lashin.

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Lashin, A.R., Schneeweiss, O. & Svoboda, M. Kinetics of Oxidation of Fe–6Si. Oxid Met 69, 359–374 (2008). https://doi.org/10.1007/s11085-008-9102-5

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  • DOI: https://doi.org/10.1007/s11085-008-9102-5

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