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Corrosion of 9Cr Steel in CO2 at Intermediate Temperature II: Mechanism of Carburization

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Abstract

In parallel to the formation of a duplex oxide scale, 9Cr–1Mo steel carburizes strongly under CO2 at 550 °C and this carburization accelerates with time. It is observed that an increase of the total CO2 pressure in the environment from 1 to 250 bars induces a higher carbon deposition in the inner Fe–Cr rich spinel oxide layer. In order to explain this phenomenon, modelling of the carburization process was carried out. A mechanism involving gas diffusion of CO2 and CO through the oxide layer, the Boudouard reaction and carbon diffusion through the metallic substrate is proposed.

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Acknowledgments

The authors are very thankful to the society SERMA for having performed observations and analyses of specimens by TEM and to Mr S. Gossé (CEA/DEN/DANS/DPC/SCP/LM2T) for providing ThermoCalc® software and database.

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Authors and Affiliations

  1. CEA, DEN, DPC, SCCME, Laboratoire d’Etude de la Corrosion Non Aqueuse, 91191, Gif-sur-Yvette, France

    F. Rouillard & G. Moine

  2. CEA, DEN, DPC, SCP, Laboratoire de Réactivité de Surfaces et Interfaces, 91191, Gif-sur-Yvette, France

    M. Tabarant

  3. CEA, DEN, DTCD, SPDE, Laboratoire des Fluides Supercritiques et Membranes, 30207, Bagnols sur Cèze, France

    J. C. Ruiz

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  1. F. Rouillard
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  2. G. Moine
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  3. M. Tabarant
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  4. J. C. Ruiz
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Correspondence to F. Rouillard.

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Rouillard, F., Moine, G., Tabarant, M. et al. Corrosion of 9Cr Steel in CO2 at Intermediate Temperature II: Mechanism of Carburization. Oxid Met 77, 57–70 (2012). https://doi.org/10.1007/s11085-011-9272-4

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  • DOI: https://doi.org/10.1007/s11085-011-9272-4

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