期刊
FUEL PROCESSING TECHNOLOGY
卷 104, 期 -, 页码 253-264出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2012.05.020
关键词
Ferritic steel; High temperature oxidation; Nickel-based alloy; Potassium chloride; Potassium carbonate; Water vapor
资金
- National Technology Agency of Finland (TEKES)
- Andritz Oy
- Metso Power Oy
- Oy Metsa-Botnia Ab
- Foster Wheeler Energia Oy
- UPM-Kymmene OYj
- Clyde Bergemann GmbH
- International Paper Inc.
- Top Analytica Oy Ab.
- Finnish Graduate School of Chemical Engineering
The influence of both solid KCl and solid K2CO3 on the oxidation behavior of a ferritic 10CrMo type steel and a nickel-based Alloy 625 type steel was investigated in the laboratory. Samples were exposed for a week at temperatures of 500 degrees C, 550 degrees C, and 600 degrees C. The role of water vapor was also studied by carrying out exposures under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to determine the extent of corrosion, the elemental distribution, and the identification of corrosion products. Both salts were found to be corrosive towards both steels, but the influence of KCl was significantly greater than that of K2CO3. In terms of durability. Alloy 625 exhibited higher corrosion resistance than 10CrMo. In the case of 10CrMo, the oxide formed always consisted of iron oxide with a chromium-rich region near the original steel surface. In the case of Alloy 625, the oxide consisted mainly of nickel oxide when it formed in the presence of KCl, and chromium oxide when it formed in the presence of K2CO3. (C) 2012 Elsevier B.V. All rights reserved.
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