期刊
CORROSION SCIENCE
卷 155, 期 -, 页码 29-45出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.04.010
关键词
Stainless steel; SEM; XPS; High-temperature corrosion; Alkali salts
资金
- National Technology Agency of Finland (Tekes)
- Andritz Oy
- Valmet Technologies Oy
- Amec Foster Wheeler Energia Oy
- UPM-Kymmene Oyj
- Clyde Bergemann GmbH
- International Paper Inc.
- Top Analytica Oy Ab
- Academy of Finland project Novel Approaches to Study Corrosion Mechanisms in High-temperature Industrial Processes [296435]
The initial stage of oxidation reactions at the surface of the stainless steel Sanicro 28 (Fe31Cr27Ni) exposed to KCl, NaCl, or K2CO3 in flowing dry and humid air at 535 degrees C was investigated using chronoamperometry, SEM-EDX and XPS. All studied salts accelerated the corrosion process. Na+ resulted in a higher amount of Na2CrO4 and a thicker chromium-rich scale compared to K+. CO32- was involved in a reaction with iron only under humid conditions. The results show that humidity affects the corrosion mechanisms and it should thus be taken into account especially in the combustion of biomasses with high humidity.
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