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The Effects of Chromium on the High Temperature Corrosion of Ni–Cr Alloys Exposed to Calcium Sulfate

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Abstract

Calcium- and sulfur-rich deposits have been linked to failure of turbine components as a consequence of high temperature exposures (> 1000 °C). There are only limited studies on the effects of these deposits on the degradation behavior of turbine alloys. To gain further understanding of this phenomenon, a systematic study was undertaken with model binary nickel–chromium alloys. Three alloys with different chromium contents—low, medium and high—represented by Ni-5Cr, Ni-10Cr and Ni-18Cr, were exposed to CaSO4-deposit-induced corrosion in the 900–1100 °C temperature range. At 1000 and 1100 °C, the decomposition of CaSO4 (either by decomposition to CaO and SO3 or by reacting with Cr2O3) led to the formation of calcium chromates and chromium sulfides. At the lower temperature, 900 °C, the limited decomposition of CaSO4 allowed the formation of a continuous Cr2O3 scale.

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Acknowledgements

Funding for this project from the Office of Naval Research (ONR Award # N00014-21-1-2751; Mr. Anthony C. Smith, Sr., Director, DoN HBCU/MI Program, and Dr. David Shifler, Technical SME/POC) is gratefully acknowledged. The authors thank Regina Dilig, Ulus Ekerman, Harjot Singh, Karla Sanchez, Logan Gallegos and Lily Pelayo for their contributions.

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  1. California State Polytechnic University, Pomona, 3801 W. Temple Ave., Pomona, CA, 91768, USA

    Nicholas Ury & Vilupanur Ravi

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  1. Nicholas Ury
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  2. Vilupanur Ravi
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Contributions

The authors contributed as follows: NU carried out corrosion experiments, XRD, optical and SEM, data analysis and manuscript writing; VR supervised the work and was responsible for experimental design, project support, discussions and guidance, manuscript writing, review and editing.

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Correspondence to Vilupanur Ravi.

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Ury, N., Ravi, V. The Effects of Chromium on the High Temperature Corrosion of Ni–Cr Alloys Exposed to Calcium Sulfate. High Temperature Corrosion of mater. (2024). https://doi.org/10.1007/s11085-024-10232-3

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  • DOI: https://doi.org/10.1007/s11085-024-10232-3

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