The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K

The effect of water vapor on high temperature oxidation was studied based on Wagner’s theory of binary alloy oxidation. The oxidation of Fe-Cr alloys was carried out at 1073K in dry and humid conditions. The oxidation was conducted in a closed apparatus at 1073K and the oxygen partial pressure of...

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Main Authors:	Ani, Mohd Hanafi, Kodama, Toshiya, Ueda, Mitsutoshi, Kawamura, Kenichi, Maruyama, Toshio
Format:	Article
Language:	English
Published:	Japan Institute of Metals 2009
Subjects:	TA401 Materials of engineering and construction
Online Access:	http://irep.iium.edu.my/4087/ http://irep.iium.edu.my/4087/ http://irep.iium.edu.my/4087/ http://irep.iium.edu.my/4087/1/water_vapor_effect_on_transition_from_internal_to_external_oxidation.pdf

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spelling	iium-40872011-10-19T03:30:16Z http://irep.iium.edu.my/4087/ The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K Ani, Mohd Hanafi Kodama, Toshiya Ueda, Mitsutoshi Kawamura, Kenichi Maruyama, Toshio TA401 Materials of engineering and construction The effect of water vapor on high temperature oxidation was studied based on Wagner’s theory of binary alloy oxidation. The oxidation of Fe-Cr alloys was carried out at 1073K in dry and humid conditions. The oxidation was conducted in a closed apparatus at 1073K and the oxygen partial pressure of 1:1 � 10�14 Pa, which was fixed by a Fe/FeO buffer. To prepare the humid condition, Ar-5% H2 gas mixture of 3 � 104 Pa was filled in the apparatus, which provided the water vapor pressure of 3:3 � 102 Pa. The transition of internal and external oxidation was observed in Fe-8Cr in the dry condition and in Fe-12Cr in the humid condition. Interdiffusion experiment of Fe/Fe-16Cr diffusion couples in dry and humid environments showed that the diffusion coefficient of Cr was not influenced by dissolved hydrogen. The oxygen permeability in �-Fe was determined by means of internal oxidation of Fe-5Cr alloy at 1073K and the oxygen partial pressure of 1:1 � 10�14 Pa in a dry and two humid conditions with water vapor of 1:1 � 102 Pa and 3:3 � 102 Pa. The oxygen permeability in humid condition increases by a factor of 1.4. Dissolved hydrogen increases the oxygen permeability, thus increases the minimum concentration of Cr to form external scales in humid conditions. The presence of dissolved hydrogen changes the oxide shape from discrete spherical particle to spikelike precipitates, which enhances the oxygen transport along the metal/oxide precipitates interface. Japan Institute of Metals 2009 Article PeerReviewed application/pdf en http://irep.iium.edu.my/4087/1/water_vapor_effect_on_transition_from_internal_to_external_oxidation.pdf Ani, Mohd Hanafi and Kodama, Toshiya and Ueda, Mitsutoshi and Kawamura, Kenichi and Maruyama, Toshio (2009) The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K. Materials Transactions, 50 (11). pp. 2656-2663. ISSN 1347-5320 (O), 1345-9678 (P) http://www.jim.or.jp/journal/e/50/11/2656.html [doi:10.2320/matertrans.M2009212]
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TA401 Materials of engineering and construction
spellingShingle	TA401 Materials of engineering and construction Ani, Mohd Hanafi Kodama, Toshiya Ueda, Mitsutoshi Kawamura, Kenichi Maruyama, Toshio The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K
description	The effect of water vapor on high temperature oxidation was studied based on Wagner’s theory of binary alloy oxidation. The oxidation of Fe-Cr alloys was carried out at 1073K in dry and humid conditions. The oxidation was conducted in a closed apparatus at 1073K and the oxygen partial pressure of 1:1 � 10�14 Pa, which was fixed by a Fe/FeO buffer. To prepare the humid condition, Ar-5% H2 gas mixture of 3 � 104 Pa was filled in the apparatus, which provided the water vapor pressure of 3:3 � 102 Pa. The transition of internal and external oxidation was observed in Fe-8Cr in the dry condition and in Fe-12Cr in the humid condition. Interdiffusion experiment of Fe/Fe-16Cr diffusion couples in dry and humid environments showed that the diffusion coefficient of Cr was not influenced by dissolved hydrogen. The oxygen permeability in �-Fe was determined by means of internal oxidation of Fe-5Cr alloy at 1073K and the oxygen partial pressure of 1:1 � 10�14 Pa in a dry and two humid conditions with water vapor of 1:1 � 102 Pa and 3:3 � 102 Pa. The oxygen permeability in humid condition increases by a factor of 1.4. Dissolved hydrogen increases the oxygen permeability, thus increases the minimum concentration of Cr to form external scales in humid conditions. The presence of dissolved hydrogen changes the oxide shape from discrete spherical particle to spikelike precipitates, which enhances the oxygen transport along the metal/oxide precipitates interface.
format	Article
author	Ani, Mohd Hanafi Kodama, Toshiya Ueda, Mitsutoshi Kawamura, Kenichi Maruyama, Toshio
author_facet	Ani, Mohd Hanafi Kodama, Toshiya Ueda, Mitsutoshi Kawamura, Kenichi Maruyama, Toshio
author_sort	Ani, Mohd Hanafi
title	The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K
title_short	The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K
title_full	The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K
title_fullStr	The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K
title_full_unstemmed	The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K
title_sort	effect of water vapor on high temperature oxidation of fe-cr alloys at 1073k
publisher	Japan Institute of Metals
publishDate	2009
url	http://irep.iium.edu.my/4087/ http://irep.iium.edu.my/4087/ http://irep.iium.edu.my/4087/ http://irep.iium.edu.my/4087/1/water_vapor_effect_on_transition_from_internal_to_external_oxidation.pdf
first_indexed	2023-09-18T20:12:10Z
last_indexed	2023-09-18T20:12:10Z
_version_	1777407550455545856

The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073K

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