Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1289469 | Journal of Power Sources | 2009 | 5 Pages |
Abstract
Reactivity of oxide scale on Fe-Cr alloy with Na-containing gases was examined to estimate the stability against sodium (Na): vapors of NaCl and Na2SO4 exposures with air flow at 1073Â K. The identified reaction phases were Cr-Mn spinel, Cr2O3, and alloy from the X-ray diffraction of surface with no Na-reaction products. However, the protective oxide scales (Mn-Cr spinel and Cr2O3 layers) on the Fe-Cr alloy were partially decomposed by reacting with Na to form Na-compounds inside the oxide scale/alloy interfaces. In some parts, anomalous oxide scales were found around the oxide scale/Fe-Cr alloy interfaces, with forming Na-rich compounds: the compounds were distributed inner parts of oxide scales around oxide scale/alloy interfaces. The stability of oxide scales and degradation were discussed based on the observed distribution of elements.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Teruhisa Horita, Haruo Kishimoto, Katsuhiko Yamaji, Manuel E. Brito, Yueping Xiong, Harumi Yokokawa,