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Chapitre D'ouvrage Année : 2020

High temperature steam oxidation of chromium-coated zirconium-based alloys: Kinetics and process

Elodie Rouesne
  • Fonction : Auteur
Joël Ribis
  • Fonction : Auteur
Thomas Guilbert
  • Fonction : Auteur
Stéphane Urvoy
  • Fonction : Auteur
Guillaume Nony
  • Fonction : Auteur
Matthieu Le Saux
Nihed Chaabane
  • Fonction : Auteur
Hervé Palancher
  • Fonction : Auteur
Amandine David
  • Fonction : Auteur
Jérémy Bischoff
  • Fonction : Auteur
Julien Augereau
  • Fonction : Auteur
Edouard Pouillier
  • Fonction : Auteur

Résumé

The oxidation of chromium-coated zirconium-based alloys is studied under steam at temperatures ranging from 800 °C up to 1500 °C and for oxidation times ranging from a few minutes up to a few hours. For oxidation temperatures up to 1300 °C, the overall oxidation kinetics is nearly parabolic at the beginning of oxidation, when the Cr outer layer is protective. Finally, it significantly accelerates and hydrogen is absorbed during a short period. These steps correspond to different oxidation and diffusion mechanisms, involving: growth of outer chromia scale; Zr-Cr interdiffusion, inducing Zr(Cr,Fe) 2 intermetallic layer thickening then disappearance due to transformation into metallic chromium and zirconia; transport of oxygen through residual chromium (in particular along grain boundaries) and into the zirconium substrate, and finally growth of a sub-coating zirconia. The additional effect of the Zr-Cr eutectic reaction occurring when the oxidation temperature is increased beyond 1300 °C is also studied and briefly discussed.

Dates et versions

hal-04428037 , version 1 (31-01-2024)

Identifiants

Citer

Jean-Christophe Brachet, Elodie Rouesne, Joël Ribis, Thomas Guilbert, Stéphane Urvoy, et al.. High temperature steam oxidation of chromium-coated zirconium-based alloys: Kinetics and process. Corrosion science, 167, 2020, ⟨10.1016/j.corsci.2020.108537⟩. ⟨hal-04428037⟩
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