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Evaporation of Cr2O3 in Atmospheres Containing H2O

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/734

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)

Submitter: 山内 啓

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