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In-situ method to monitor surface reaction/oxidation at high temperature

The formation of external Cr2 O3 scale is important to obtain the oxidation resistance of Fe-Cr alloys at high temperatures. It is well known that the critical concentration of Cr to form protective external scale of Cr2 O3 in humid condition is higher than that in dry condition, and the cri...

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Main Authors: Ani, Mohd Hanafi, Othman, Raihan, Ueda, Mitsutoshi, Kawamura, Kenichi, Maruyama, Toshio
Format: Conference or Workshop Item
Language:English
Published: 2010
Subjects:
TP Chemical technology
Online Access:http://irep.iium.edu.my/23104/1/p39.pdf
http://irep.iium.edu.my/23104/
http://www.iium.edu.my/irie/10/
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spelling my.iium.irep.231042013-06-19T03:02:48Z http://irep.iium.edu.my/23104/ In-situ method to monitor surface reaction/oxidation at high temperature Ani, Mohd Hanafi Othman, Raihan Ueda, Mitsutoshi Kawamura, Kenichi Maruyama, Toshio TP Chemical technology The formation of external Cr2 O3 scale is important to obtain the oxidation resistance of Fe-Cr alloys at high temperatures. It is well known that the critical concentration of Cr to form protective external scale of Cr2 O3 in humid condition is higher than that in dry condition, and the criterion of this concentration is expressed as Wagner’s equation. To determine this concentration experimentally, a lot of mass gain data and metallographic surveys are required. An in-situ method of continuous monitoring of surface oxygen potential by oxygen concentration cell using stabilized zirconia has been developed and applied to the oxidation of Fe-Cr alloy in order to check the protectiveness of the scale. In our previous work, the oxygen chemical potential on growing oxide scales during high temperature oxidation of Fe, Ni, and Co were successfully measured. In this study, the surface oxygen potentials of Fe-0~17 wt% Cr alloys in Ar- 21%O2 gas as dry condition and Fe-10~22 wt% Cr alloys in Ar-20%O2 -20%H2 O gas as humid condition were measured at 1073 K up to 20 ks. In dry condition, the surface oxygen potentials of Fe with more than 10 wt% Cr alloys were close to the oxygen potential of atmosphere immediately after the heating period. It indicates that protective Cr2 O3 scale formed on these alloys at early stage of oxidation. However, the surface oxygen potentials of these same composition alloys were lower in humid condition than that in dry. By this method, the protectiveness of scales formed on Fe-Cr alloys can be evaluated in-situ in a few hours. 2010 Conference or Workshop Item REM application/pdf en http://irep.iium.edu.my/23104/1/p39.pdf Ani, Mohd Hanafi and Othman, Raihan and Ueda, Mitsutoshi and Kawamura, Kenichi and Maruyama, Toshio (2010) In-situ method to monitor surface reaction/oxidation at high temperature. In: IIUM Research, Innovation & Invention Exhibition (IRIIE 2010), 26 - 27 January 2010, Kuala Lumpur. http://www.iium.edu.my/irie/10/
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Ani, Mohd Hanafi
Othman, Raihan
Ueda, Mitsutoshi
Kawamura, Kenichi
Maruyama, Toshio
In-situ method to monitor surface reaction/oxidation at high temperature
description The formation of external Cr2 O3 scale is important to obtain the oxidation resistance of Fe-Cr alloys at high temperatures. It is well known that the critical concentration of Cr to form protective external scale of Cr2 O3 in humid condition is higher than that in dry condition, and the criterion of this concentration is expressed as Wagner’s equation. To determine this concentration experimentally, a lot of mass gain data and metallographic surveys are required. An in-situ method of continuous monitoring of surface oxygen potential by oxygen concentration cell using stabilized zirconia has been developed and applied to the oxidation of Fe-Cr alloy in order to check the protectiveness of the scale. In our previous work, the oxygen chemical potential on growing oxide scales during high temperature oxidation of Fe, Ni, and Co were successfully measured. In this study, the surface oxygen potentials of Fe-0~17 wt% Cr alloys in Ar- 21%O2 gas as dry condition and Fe-10~22 wt% Cr alloys in Ar-20%O2 -20%H2 O gas as humid condition were measured at 1073 K up to 20 ks. In dry condition, the surface oxygen potentials of Fe with more than 10 wt% Cr alloys were close to the oxygen potential of atmosphere immediately after the heating period. It indicates that protective Cr2 O3 scale formed on these alloys at early stage of oxidation. However, the surface oxygen potentials of these same composition alloys were lower in humid condition than that in dry. By this method, the protectiveness of scales formed on Fe-Cr alloys can be evaluated in-situ in a few hours.
format Conference or Workshop Item
author Ani, Mohd Hanafi
Othman, Raihan
Ueda, Mitsutoshi
Kawamura, Kenichi
Maruyama, Toshio
author_facet Ani, Mohd Hanafi
Othman, Raihan
Ueda, Mitsutoshi
Kawamura, Kenichi
Maruyama, Toshio
author_sort Ani, Mohd Hanafi
title In-situ method to monitor surface reaction/oxidation at high temperature
title_short In-situ method to monitor surface reaction/oxidation at high temperature
title_full In-situ method to monitor surface reaction/oxidation at high temperature
title_fullStr In-situ method to monitor surface reaction/oxidation at high temperature
title_full_unstemmed In-situ method to monitor surface reaction/oxidation at high temperature
title_sort in-situ method to monitor surface reaction/oxidation at high temperature
publishDate 2010
url http://irep.iium.edu.my/23104/1/p39.pdf
http://irep.iium.edu.my/23104/
http://www.iium.edu.my/irie/10/
_version_ 1643608521041772544
score 13.211869

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