期刊
ENERGY & FUELS
卷 28, 期 10, 页码 6447-6458出版社
AMER CHEMICAL SOC
DOI: 10.1021/ef5017335
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资金
- Danish Strategic Research Centre, Power Generation from Renewable Energy (GREEN)
- Danish Council for Strategic Research
An austenitic stainless steel (TP 347H FG) was coated with a synthetic deposit and exposed, under laboratory conditions simulating straw-firing at 560 degrees C, for 1 week. Microscopic, diffraction, and spectroscopic techniques were employed for cross-sectional and plan view top-down microstructural characterization of the corrosion products. The corrosion products consisted of three layers: (i) the outermost layer consists of a mixed layer of K2SO4 and FexOy on a partly molten layer of the initial deposit, (ii) the middle layer consists of spinel (FeCr2O4) and Fe2O3, and (iii) the innermost layer is a sponge-like Ni3S2-containing layer. At the corrosion front, Cl-rich protrusions were observed. Results indicate that selective corrosion of Fe and Cr by Cl, active oxidation, and sulfidation attack of Ni are possible corrosion mechanisms.
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