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Chromium transport through Cr2O3 scales I. On lattice diffusion of chromium

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Abstract

Cr specimens preoxidized at 1100–1300°C to give Cr2O3 scales with varying thicknesses and microstructures have been treated at temperature in high vacuum. During the high vacuum treatment the specimens lose weight due to outward Cr transport through the Cr2O3 scales. The initial rate of weight loss gradually diminishes, but eventually the weight loss reaches a linear rate. Concurrently the Cr2O3 scale exhibits grain growth and densifies. It is concluded that the mode of outward chromium transport gradually changes during the high vacuum treatment: from lattice and grain-boundary diffusion and possibly vapor transport along microcracks during the initial stage to lattice diffusion only for the densified scales. It is concluded that chromium diffuses by an interstitial type mechanism. Self-diffusion coefficients of Cr in Cr2O3 at the Cr-Cr2O3 phase boundary have been calculated from the linear rates of chromium transport for different defect structure situations.

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Authors and Affiliations

  1. Department of Chemistry, University of Oslo, Blindern, P.B. 1033, Oslo 3, Norway

    P. Kofstad & K. P. Lillerud

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  1. P. Kofstad
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  2. K. P. Lillerud
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Kofstad, P., Lillerud, K.P. Chromium transport through Cr2O3 scales I. On lattice diffusion of chromium. Oxid Met 17, 177–194 (1982). https://doi.org/10.1007/BF00738381

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  • DOI: https://doi.org/10.1007/BF00738381

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