Abstract
Samples of sol–gel alumina-coated and uncoated P92 steel were exposed to flue gas at 650 °C for 300 h to register and characterize the early stages of the protection effect of that coating. As a result of this treatment, a 50-µm-thick bilayered oxide scale had formed on the surface of the uncoated sample. Below the scale a 40-µm-thick inner oxidation zone was detected. In contrast, the porous, micron-thick alumina coating enabled the formation of a chromium oxide scale with a thickness of some nanometres at the interface between steel substrate and coating. In this case, high-temperature corrosion of the steel was prevented so far.
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Acknowledgements
This work was initiated and financially supported by the European project “Production of Coatings for New Efficient and Clean Coal Power Plant Materials” (POEMA, FP7-NMP, 310436). Special thanks to G. Oder for the EPMA investigations.
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Nofz, M., Dörfel, I., Sojref, R. et al. Thin Sol–Gel Alumina Coating as Protection of a 9% Cr Steel Against Flue Gas Corrosion at 650 °C. Oxid Met 89, 453–470 (2018). https://doi.org/10.1007/s11085-017-9799-0
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DOI: https://doi.org/10.1007/s11085-017-9799-0