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Initial oxidation of Cr at 300–730 K in H2 18O/H2 16O/16O2 gas mixtures studiedin situ with18O/SIMS and XPS

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Abstract

The initial oxidation of pure, polycrystalline-chromium metal with gas mixtures of oxygen-labeled water, H2 18O, and oxygen,16O2, at temperatures 300–730 K has been studied in situ with secondary ion mass spectrometry, SIMS. The fraction of O in secondary ion species: CrO+, Cr2O+, CrOH+, Cr2OH+, CrOH2 +, and Cr2OH2 + originating from water and oxygen was found. The reaction of water and oxygen in the oxygen/water gas mixture with Cr is then revealed. The dissociation of water in its reaction with Cr in such a gas mixture was analyzed. Oxide growth on cleaned Cr surfaces during the reaction with H2O, O2 and H2O/O2 gas was also studied in situ with X-ray photoelectron spectroscopy, XPS. A correlation between a chemical shift in XPS and the OH content in the oxide is discussed.

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  1. Department of Corrosion Science, The Royal Institute of Technology, Osquldas väg. 4-6, S-100 44, Stockholm, Sweden

    Qin Lu

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  1. Qin Lu
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Lu, Q. Initial oxidation of Cr at 300–730 K in H2 18O/H2 16O/16O2 gas mixtures studiedin situ with18O/SIMS and XPS. Oxid Met 40, 421–432 (1993). https://doi.org/10.1007/BF00666384

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  • DOI: https://doi.org/10.1007/BF00666384

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