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Oxygen exchange in oxidation of an Fe-20Cr-10Al alloy in ∼10 mbar O2/H2O-gas mixtures at 920°C

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Abstract

The oxidation of an alumina forming Fe-200-10Al alloy was studied in situ. The gas phase components in isotopically labeled ∼10 mbar O2/H2O-gas mixtures were measured from a virtually closed system at 920°C. Oxidation rates and oxygen-exchange rates were measured and related to each other. From the exchange rates the dissociation rates of O2 and H2O were calculated. These dissociation rates were in the early stage of oxidation found to be the same as the oxidation rate. The rate of oxygen exchange with the oxide can exceed the oxidation rate. From this follows that in analysis of a two-stage oxidation in16,16O2/18,18O2 the exchange rate of O between the oxide and gas phase has to be considered. The oxides formed in H2O containing gas had a H/O-ratio of ∼0.1. Vacuum annealing of the alloy before oxidation increased the oxidation rate by a factor of ∼2.

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Authors and Affiliations

  1. Div. of Corr. Sci., Dep. of Materials Sci. and Eng., Royal Inst. of Techn., 100 44, Stockholm, Sweden

    T. Åkermark & G. Hultquist

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  1. T. Åkermark
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  2. G. Hultquist
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Åkermark, T., Hultquist, G. Oxygen exchange in oxidation of an Fe-20Cr-10Al alloy in ∼10 mbar O2/H2O-gas mixtures at 920°C. Oxid Met 47, 117–137 (1997). https://doi.org/10.1007/BF01682374

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  • DOI: https://doi.org/10.1007/BF01682374

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