Abstract
Ferritic stainless steels used as interconnectors in SOFC stacks are subjected to air and fuel atmospheres at 800 °C. The use of hydrogen as fuel gas may be substituted by fermentative biogas consisting of mainly CO2 and CH4. In this gas mixture, carbon dioxide leads to steel oxidation whereas methane induces carburization. The objective of this study was to investigate the oxidation kinetics of the AISI 441 ferritic stainless steel under pure CO2 in order to understand oxidation mechanisms. The results show that the kinetic behaviour is linear at low temperatures (800–900 °C) and initially linear then parabolic at higher temperatures (925–1,000 °C). Oxide scale consisted of major Cr2O3-rich oxide, topped with MnCr2O4 and a dispersion of TiO2. The chromium-rich oxide was analysed by using the photoelectrochemical method. It exhibits N-type semi-conductor. Oxidation kinetics is modelled by the mixed surface and oxide-diffusion limited steps.
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Acknowledgments
This work was conducted in the frame of the 2007–2008 “Hubert Curien” Franco-Thai program on “Biogas-fuelled SOFC interconnect: Reactivity and Surface modification” coordinated by the Thai-French Innovation Centre (TFIC) of King Mongkut’s University of Technology North Bangkok. This research has also been under international PhD thesis co-supervision between Grenoble INP and Chulalongkorn University. The authors thank Mr. Abdel halim Loucif for technical support of photoelectrochemistry.
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Promdirek, P., Lothongkum, G., Chandra-Ambhorn, S. et al. Oxidation Kinetics of AISI 441 Ferritic Stainless Steel at High Temperatures in CO2 Atmosphere. Oxid Met 81, 315–329 (2014). https://doi.org/10.1007/s11085-013-9432-9
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DOI: https://doi.org/10.1007/s11085-013-9432-9