Abstract
The corrosion behavior of metals and alloys at high temperatures in complex multi-oxidant environments is of a great interest for achieving extended service performances and improved operation efficiencies. In this basic study, the scaling reactions of pure chromium in several multi-oxidant gas mixtures were assessed. The environments studied are similar to those that exist in low-NOx burner and coal gasification atmospheres, which are very reducing and favor sulfidation and carburization, together with possible formation of Cr2O3. The effect of sulfur on chromia-scale growth kinetics was also considered. Isothermal exposures were done for up to 100 h at 871 °C (1600 °F), and comparison was made to similar exposures to air. Exposed samples were characterized in detail using some combination of X-ray diffraction and electron beam scattering and spectroscopic techniques. It was found that chromia scales formed in mixed gases containing water vapor grew much faster and had a finer grain structure than those formed in dry air. Both inward growth and outward growth of the chromia scale were inferred for the mixed-gas conditions. The effect of a high carbon potential in the gas on the scaling behavior is also discussed.
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The authors would like to thank Prof. Gerald Meier for helpful discussions and Dr. Sahar Farjami for technical assistance on EBSD sample preparation and microscopy.
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Soltanattar, S., Nowakowski, P., Bonifacio, C.S. et al. Use of Microanalysis to Better Understand the High-Temperature Corrosion Behavior of Chromium Exposed to Multi-Oxidant Environments. Oxid Met 91, 11–31 (2019). https://doi.org/10.1007/s11085-018-9882-1
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DOI: https://doi.org/10.1007/s11085-018-9882-1