Kinetics and mechanism of reaction between water vapor, carbon monoxide and a chromia-forming nickel base alloy

Jérôme Chapovaloff 1, 2, 3 Fabien Rouillard 4 Krzysztof Wolski 1, 2, 3 Michèle Pijolat 3, 5, 6
1 MPI-ENSMSE - Département Mécanique physique et interfaces
2 SMS-ENSMSE - Centre Science des Matériaux et des Structures
3 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel
4 LECNA - Laboratoire d'Etude de la Corrosion Non Aqueuse
DPC - Département de Physico-Chimie : DEN/DPC/SCCME/LECNA
5 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
6 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs
Abstract : The kinetic aspects of the competitive reaction of CO and H2O in the formation of chromia layer on a nickel base alloy at high temperature were studied by thermogravimetry combined to gas phase chromatography. It was shown that competitive adsorption occurred between both molecules and that whatever P-CO/P-H2O ratio, CO mainly reacted in the first instants of oxidation and H2O became the main long-term oxidant species. After an interfacial and diffusion mixed kinetic regime, the long-term oxidation rate was parabolic and did not depend on the water vapor content in the gas phase. The oxidation kinetics was well described by considering that the rate limiting step was the outwards diffusion of interstitial chromium cations in the oxide layer. (C) 2012 Elsevier Ltd. All rights reserved.
Keywords : Superalloys High temperature Corrosion Oxidation Reactor conditions HIGH-TEMPERATURE ALLOYS GAS-COOLED REACTORS PRIMARY CIRCUIT HELIUM IMPURE HELIUM THERMAL-OXIDATION CORROSION INCONEL-617 ATMOSPHERE IMPURITIES SURFACES
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Article dans une revue
Corrosion Science, Elsevier, 2013, 69, pp.31-42. 〈10.1016/j.corsci.2012.09.045〉
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Contributeur : Géraldine Fournier-Moulin <>
Soumis le : lundi 10 mars 2014 - 16:41:55
Dernière modification le : vendredi 24 novembre 2017 - 15:28:19

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Jérôme Chapovaloff, Fabien Rouillard, Krzysztof Wolski, Michèle Pijolat. Kinetics and mechanism of reaction between water vapor, carbon monoxide and a chromia-forming nickel base alloy. Corrosion Science, Elsevier, 2013, 69, pp.31-42. 〈10.1016/j.corsci.2012.09.045〉. 〈emse-00957611〉

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