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Evaporation of Cr2O3 in Atmospheres Containing H2O
Title: | Evaporation of Cr2O3 in Atmospheres Containing H2O |
Authors: | Yamauchi, Akira1 Browse this author | Kurokawa, Kazuya Browse this author →KAKEN DB | Takahashi, Hideaki Browse this author |
Authors(alt): | 山内, 啓1 |
Keywords: | High temperature oxidation | H2O-Containing atmosphere | Evaporation of Cr2O3 | Deterioration of Cr2O3 scale |
Issue Date: | Jun-2003 |
Publisher: | Springer |
Journal Title: | Oxidation of Metals |
Volume: | 59 |
Issue: | 5/6 |
Start Page: | 517 |
End Page: | 527 |
Publisher DOI: | 10.1023/A:1023671206976 |
Abstract: | Stainless steels in atmospheres containing H2O form a Cr2O3 scale in the early stage of oxidation. However, the Cr2O3 scale gradually degrades with time. In order to determine the effect of H2O on the deterioration of a Cr2O3 scale, evaporation behavior of Cr2O3 in N2-O2-H2O atmospheres was investigated. The rate of mass loss in a N2-O2-H2O atmosphere was found to be one order of magnitude higher than the rates in N2-O2 and N2-H2O atmospheres, indicating that deterioration of the Cr2O3 scale is likely to occur in mixed atmospheres of oxygen and water vapor. Volatilization of Cr2O3 is probably based on the following reactions: 1/2 Cr2O3(s)+ 3/4 O2(g)+ H2O(g)= CrO2(OH)2(g). However, it was also speculated that the reaction, Cr2O3(s)+ 3/2 O2(g)= 2 CrO3(g), affects the evaporation of Cr2O3 at temperatures higher than 1323 K. The evaporation rate of Cr2O3 is roughly comparable to the growth rate of the Cr2O3 scale. Therefore, a Cr2O3 scale can be degraded by the evaporation of Cr2O3. |
Rights: | The original publication is available at www.springerlink.com |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/734 |
Appears in Collections: | エネルギー・マテリアル融合領域研究センター (Center for Advanced Research of Energy and Material) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山内 啓
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