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Corrosion mechanism of a Ni-based alloy in supercritical water: Impact of surface plastic deformation

Article dans une revue avec comité de lecture
Author
PAYET, Mickaël
213743 Propriétés et architectures des alliages et mélanges [P2AM]
MARCHETTI, Loïc
40016 Laboratoire d'Etude de la Corrosion Aqueuse [LECA]
TABARANT, Michel
186210 laboratoire d'ingénierie des surfaces et lasers [LISL]
CHEVALIER, Jean-Pierre
213743 Propriétés et architectures des alliages et mélanges [P2AM]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/10367
DOI
10.1016/j.corsci.2015.06.032
Date
2015
Journal
Corrosion Science

Abstract

Ni–Fe–Cr alloys are expected to be a candidate material for the generation IV nuclear reactors that use supercritical water at temperatures up to 600 °C and pressures of 25 MPa. The corrosion resistance of Alloy 690 in these extreme conditions was studied considering the surface finish of the alloy. The oxide scale could suffer from dissolution or from internal oxidation. The presence of a work-hardened zone reveals the competition between the selective oxidation of chromium with respect to the oxidation of nickel and iron. Finally, corrosion mechanisms for Ni based alloys are proposed considering the effects of plastically deformed surfaces and the dissolution.

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