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Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

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Abstract

The halogen effect, which involves the surface enrichment of an alloy with a halogen element to result in improved oxidation resistance, was assessed using model Ni-based Ni–Cr–Al alloys. The alloys studied varied in composition in a manner that produced sub-critical, borderline and protective intrinsic oxidation behaviours from the standpoint of being able to form a continuous Al2O3 scale. Fluorine-ion implantation allowed for a well-defined surface do** of the alloys. It was found that this do** could promote protective Al2O3-scale formation during oxidation at 900 and 1,000 °C in both dry and steam-containing atmospheres. Specifically, the beneficial halogen effect was manifested by lowering the critical Al content in Ni–Cr–Al alloys needed for Al2O3-scale formation.

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Acknowledgments

The work was supported by the Deutsche Forschungsgemeinschaft (DFG) under contracts SCHU 729/24-1 and DO 604/17-1 which is gratefully acknowledged. The authors thank Dr. L. Schmidt and Dr. K. E. Stiebing from the Institute of Nuclear Physics of the Goethe-University Frankfurt for their support while using the implanter and the Van de Graaff-accelerator.

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Authors and Affiliations

  1. DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486, Frankfurt am Main, Germany

    H.-E. Zschau & M. Schütze

  2. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, 815 Benedum Hall, 3700 O’Hara Street, Pittsburgh, PA, 15261, USA

    W. Zhao & B. Gleeson

  3. Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438, Frankfurt am Main, Germany

    S. Neve

Authors
  1. H.-E. Zschau
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  2. W. Zhao
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  3. S. Neve
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  4. B. Gleeson
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  5. M. Schütze
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Correspondence to H.-E. Zschau.

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Zschau, HE., Zhao, W., Neve, S. et al. Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect. Oxid Met 83, 335–349 (2015). https://doi.org/10.1007/s11085-014-9524-1

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  • DOI: https://doi.org/10.1007/s11085-014-9524-1

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