Abstract
This study focuses on the oxidation behavior of commercially available HR120 in air at 1,050 °C from 30 min to 100 h. The oxidation kinetics were first studied by thermogravimetry and isothermal exposure. The oxidation products were fully characterized using ex and in situ X-ray diffraction (XRD) and FEG-SEM observations. HR120 experienced at 1,050 °C a non protective transient stage and formed a multilayered oxide scale (SiO2–Cr2O3–XCr2O4 with X = Mn and/or Fe, Ni). A series of complementary characterization methods (gold and isotopic marker experiments, photoelectrochemistry (PEC)) were implemented to elucidate the oxidation mechanism. The study identified a n-type semi-conductivity accompanied by an inward growth of the scale. Thus, assuming that diffusion in the oxide scale controlled chromia-scale growth, the oxygen vacancy was the major point defect governing the solid state transport. This result was attributed to the presence of a MnCr2O4 spinel layer at the top of chromia that strongly decreased the oxygen pressure at the interface spinel/chromia.
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Acknowledgments
Authors thank Ludovic Mouton and Sandrine Mathieu from SCMEM of the University of Nancy for Microscopic observations, Sylvain Weber from CCMEM of the Jean Lamour Institute for SIMS analyses, Sébastien Chevalier and Nathalie Roudergues from University of Dijon for the 18O marker analyses.
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Ledoux, X., Mathieu, S., Vilasi, M. et al. Oxide Growth Characterization During Short-Time Oxidation of a Commercially Available Chromia-Forming Alloy (HR-120) in Air at 1,050 °C. Oxid Met 80, 25–35 (2013). https://doi.org/10.1007/s11085-013-9367-1
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DOI: https://doi.org/10.1007/s11085-013-9367-1