期刊
CORROSION SCIENCE
卷 218, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2023.111217
关键词
Lithium aluminate; Pre -oxidation; Alumina forming alloys; Molten salt; High -temperature corrosion; Phase transition
Ferritic alumina-forming alloys have high corrosion resistance to molten carbonates by forming a protective alpha-LiAlO2 scale on their surface. Pre-oxidized ferritic alumina-forming alloys were exposed to (Li,Na,K)2CO3 melt at 800 degrees C for 1000 hours. Only the outer transient alumina reacts with the melt, forming LiAlO2, while the innermost alpha-Al2O3 scale remains intact. The combined presence of alpha-Al2O3/ alpha-LiAlO2 improves the corrosion protection compared to non-pre-oxidized materials by forming a superior double oxide scale.
Ferritic alumina-forming alloys showed high corrosion resistance to molten carbonates by forming a protective alpha-LiAlO2 scale at their surface. In this work, four ferritic alumina-forming alloys were pre-oxidised before exposure to (Li,Na,K)2CO3-melt at 800 degrees C for 1000 h. Only outer transient alumina, such as gamma-alumina, reacts with the melt, forming LiAlO2. At the same time, the innermost alpha-Al2O3 scale remains intact. alpha-Al2O3, as well as alpha-LiAlO2, are slow-growing compressive stress-stabilised oxide scales. Thus, the combined presence of alpha-Al2O3/ alpha-LiAlO2 improves the corrosion protection of materials investigated in this study, compared to non-pre-oxidised ones, by forming a superior double oxide scale.
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