Corrosion of T91 and pure iron in flowing and static Pb-Bi alloy between 450 °C and 540 °C: experiments, modelling and mechanism

Laure Martinelli (1) , Valery Botton (2) , Kevin Ginestar (3) , Cyrille Delisle , Fanny Balbaud (4)

1 LM2T - Laboratoire de Modélisation, Thermodynamique et Thermochimie
2 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
3 LECNA - Laboratoire d'Etude de la Corrosion Non Aqueuse
4 SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement

T91 (Fe-9Cr steel) and pure iron were corroded in pure dissolution domain in liquid lead bismuth eutectic (LBE) from 450 to 540°C in static and in dynamic LBE flow. The modelling showed that corrosion rates were controlled: (i) for LBE natural convection, by the iron diffusion in the diffusion boundary layer; (ii) for flowing LBE, by a mixed process combining both the interfacial reaction rate of iron dissolution and the iron diffusion rate in the diffusion boundary layer. By fitting the modelling on the experimental points, the iron dissolution reaction rate constant was determined.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Laure Martinelli, Valery Botton, Kevin Ginestar, Cyrille Delisle, Fanny Balbaud. Corrosion of T91 and pure iron in flowing and static Pb-Bi alloy between 450 °C and 540 °C: experiments, modelling and mechanism. Corrosion Science, 2020, pp.108897. ⟨cea-04481676⟩