High Temperature Corrosion under Laboratory Conditions Simulating Biomass-Firing: A Comprehensive Characterization of Corrosion Products

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• 作者：Sunday Chukwudi Okoro ; Melanie Montgomery ; Flemming Jappe Frandsen ; Karen Pantleon
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：28
• 期：10
• 页码：6447-6458
• 全文大小：936K
• ISSN：1520-5029

文摘

An austenitic stainless steel (TP 347H FG) was coated with a synthetic deposit and exposed, under laboratory conditions simulating straw-firing at 560 掳C, for 1 week. Microscopic, diffraction, and spectroscopic techniques were employed for cross-sectional and plan view 鈥渢op-down鈥?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 Fe_xO_y 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.