Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

Mickaël Payet (1, 2, 3) , Loic Marchetti (3) , Michel Tabarant (4) , François Jomard (5) , Jean-Pierre Chevalier (6, 2)

1 CEA Cadarache
2 CNAM - Conservatoire National des Arts et Métiers [CNAM]
3 SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement
4 SEARS - Service d'études analytiques et de réactivité des surfaces
5 GEMAC - Groupe d'Etude de la Matière Condensée
6 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

The oxidation of 316 L stainless steel in hydrogenated supercritical water at 600 °C is strongly dependent on the effects of work hardening induced by surface finishes. The oxide scale formed under these conditions is always double-layered with an external layer of Fe-rich oxides. However, when a hardening threshold is reached, a switch in oxidation mechanisms leads to a considerable thinning of the oxide scale. This thinning results from the formation of a Cr-rich internal oxide layer that acts as a diffusion barrier against ionic species responsible for its growth but also against Fe cations implied in the external layer growth.

Mots clés: SEM; Stainless steel; SIMS; High temperature corrosion; Selective oxidation; Hardening

Domaines: Matériaux

Mickaël Payet, Loic Marchetti, Michel Tabarant, François Jomard, Jean-Pierre Chevalier. Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes. Corrosion Science, 2019, 157 (1), pp.157-166. ⟨10.1016/j.corsci.2019.05.014⟩. ⟨hal-02455977⟩