Oxidation mechanism of a Fe-9Cr-1Mo steel by liquid Pb–Bi eutectic alloy (Part III)

This paper is the third part of a global study on the oxidation process of a Fe-9Cr-1Mo martensitic steel (T91) in static liquid Pb–Bi. It focuses on the growth kinetics simulation of a duplex oxide scale. The oxide layer is composed of an internal Fe–Cr spinel layer and an external magnetite layer. The magnetite layer growth is controlled by iron diffusion inside the Fe–Cr spinel and the magnetite lattice. An analytical simulation, matching with the experimental kinetics, is performed. The Fe–Cr spinel layer growth kinetics is also simulated. The protective scale is determined by simulation and by an original experiment using GD–OES.