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Oxide-Layer Formation and Stability on a Nickel-Base Alloy in Impure Helium at High Temperature

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Abstract

The corrosion behavior in impure helium of Haynes 230, a nickel base alloy candidate for heat exchangers in Very High Temperature Reactors (VHTR), has been investigated. The study focused on the formation and the subsequent destruction of the surface oxide layer at 900 °C and 980 °C. In-situ gas-phase analysis coupled to post-exposure surface analyses showed that a chromium-rich surface oxide formed on Haynes 230 at 900 °C but was unstable above a critical temperature T A : the chromium-rich oxide reacted with carbon in solution in the alloy to produce chromium and CO(g). The effect of carbon monoxide partial pressure in the gas phase as well as the influence of chromium and carbon activities in the alloy on T A are discussed taking thermodynamics and kinetics aspects into account.

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Acknowledgements

The authors are thankful to Mme M. C. Lafont at the Université Paul Sabatier of Toulouse for performing TEM analyses, to Mr P. Bonnaillie for the FESEM pictures performed at the CEA/DEN/DANS/DMN/SRMP and to Mr M. Tabarant for the GDOES analyses performed at the CEA/DEN/DANS/DPC/SCP/LRSI.

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Authors and Affiliations

  1. DEN/DANS/DPC/SCCME/LECNA - CEA Saclay, Gif sur Yvette, 91191, France

    F. Rouillard & C. Cabet

  2. Ecole Nationale Supérieure des Mines, MPI - CNRS UMR5146 - Centre SMS, St Etienne, 42000, France

    K. Wolski

  3. Ecole Nationale Supérieure des Mines, LMPG - CNRS UMR5148 - Centre SPIN, St Etienne, 42000, France

    M. Pijolat

Authors
  1. F. Rouillard
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  2. C. Cabet
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  3. K. Wolski
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  4. M. Pijolat
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Correspondence to F. Rouillard.

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Rouillard, F., Cabet, C., Wolski, K. et al. Oxide-Layer Formation and Stability on a Nickel-Base Alloy in Impure Helium at High Temperature. Oxid Met 68, 133–148 (2007). https://doi.org/10.1007/s11085-007-9065-y

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  • DOI: https://doi.org/10.1007/s11085-007-9065-y

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