Oxygen permeability of Fe-Ni-Cr alloys at 1100 and 1150 °C under carbon-free and carbon-containing gases

Domingo Jullian (1) , Aurélien Prillieux (1, 2) , Jianqiang Zhang (1) , David J. Young (1)

1 UNSW - School of Materials Science & Engineering
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Wagner's model of internal oxidation allows the prediction of an alloy's critical concentration of oxide forming metal required to achieve a protective oxide scale at high temperatures. The model depends on oxygen permeability in the alloy, but this parameter has not been evaluated for the Fe-Ni system, and the influence of carbon-bearing gases is unknown. Oxygen permeability measurement by internal oxidation of Fe-Ni-Cr alloys, reacted at 1100 and 1150 8C is described. Exposures in Rhines packs and flowing CO-CO2 gas mixtures serve to assess the influence of carbon on oxygen permeability at the Fe-FeO equilibrium oxygen potential. Oxygen permeability in Fe-Ni increases with iron content in a non-ideal manner in both gas environments. Higher permeability is found in carbon bearing gases for iron-rich alloys, and the size of this effect increases with temperature.

Mots clés: Oxidation

Domaines: Matériaux

Domingo Jullian, Aurélien Prillieux, Jianqiang Zhang, David J. Young. Oxygen permeability of Fe-Ni-Cr alloys at 1100 and 1150 °C under carbon-free and carbon-containing gases. Materials and Corrosion / Werkstoffe und Korrosion, 2016, 68 (2), pp.197-204. ⟨10.1002/maco.201508803⟩. ⟨hal-02003007⟩