caa a22 4500 445844140 CHVBK 20180317145353.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11085-011-9246-6 doi (NATIONALLICENCE)springer-10.1007/s11085-011-9246-6 Influence of Hydrogen and Water Vapour on the Kinetics of Chromium Oxide Growth at High Temperature [Elektronische Daten] [S. Guillou, C. Cabet, C. Desgranges, L. Marchetti, Y. Wouters] In support of the selection of structural materials for heat exchangers in helium-cooled high temperature reactors, the oxidation behaviour of the Ni-base chromia-former alloy 230 was investigated at 850°C in diluted helium atmosphere with a low water vapour content. In such a media, the equivalent partial pressure of oxygen (imposed by the $$ P_{{{\text{H}}_{2} {\text{O}}}} $$/$$ P_{{{\text{H}}_{2}}} $$ ratio) is very low ($$ P_{{{\text{O}}_{ 2} }}^{\text{eq}} $$ around 10−16Pa). The equivalent partial pressure of oxygen has no straight influence on the parabolic rate constant (k p); on the other hand, $$ P_{{{\text{H}}_{2} }} $$ and $$ P_{{{\text{H}}_{2} {\text{O}}}} $$ demonstrate a complex influence on k p. Photoelectrochemistry analyses revealed that this oxide could simultaneously contain two types of cationic defects. Specific oxidation tests with D2O showed that the oxide scale also contains hydrogen. A mechanist model is proposed in order to describe the scale growth using both cationic defects. Those theoretical results show, at least qualitatively, how $$ P_{{{\text{H}}_{2} }} $$ and $$ P_{{{\text{H}}_{2} {\text{O}}}} $$ may concurrently influence the oxidation rate. Springer Science+Business Media, LLC, 2011 Oxidation rate nationallicence Oxygen equivalent partial pressure nationallicence Hydrogen nationallicence Water vapour nationallicence Mechanist model nationallicence Guillou S. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France aut Cabet C. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France aut Desgranges C. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France aut Marchetti L. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Aqueuse, 91191, Gif-sur-Yvette, France aut Wouters Y. Science et Ingénierie des Matériaux et Procédés, CNRS UMR5266/Grenoble-INP/UJF, 38402, Saint Martin d'Hères Cedex, France aut Oxidation of Metals Springer-Verlag 76/3-4(2011-10-01), 193-214 0030-770X 76:3-4<193 2011 76 11085 https://doi.org/10.1007/s11085-011-9246-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-011-9246-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guillou S. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France aut NATIONALLICENCE 700 1- Cabet C. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France aut NATIONALLICENCE 700 1- Desgranges C. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France aut NATIONALLICENCE 700 1- Marchetti L. CEA, DEN, DPC, SCCME, Laboratoire d'Etude de la Corrosion Aqueuse, 91191, Gif-sur-Yvette, France aut NATIONALLICENCE 700 1- Wouters Y. Science et Ingénierie des Matériaux et Procédés, CNRS UMR5266/Grenoble-INP/UJF, 38402, Saint Martin d'Hères Cedex, France aut NATIONALLICENCE 773 0- Oxidation of Metals Springer-Verlag 76/3-4(2011-10-01), 193-214 0030-770X 76:3-4<193 2011 76 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer