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Parallel mechanism of growth of the oxide and α-Zr(O) layers on Zircaloy-4 oxidized in steam at high temperatures

Abstract : The kinetic behavior of Zircaloy-4 tube samples was examined during high temperature steam oxidation in order to propose a mechanism with detailed elementary steps. The study revealed that steam and hydrogen partial pressures have no effect on the reaction kinetics. Based on these experiments, the kinetic model established herein takes into account the oxide growth and the oxygen dissolution in the metal. A ratedetermining step of diffusion of oxygen vacancies in the oxide governs the kinetics of the reaction in both pre- and post-breakaway regimes meaning that the oxide growth and oxygen dissolution in the metal advance at proportional rates.
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https://hal-emse.ccsd.cnrs.fr/emse-03046188
Contributor : Fatima Lillouch <>
Submitted on : Tuesday, January 19, 2021 - 12:42:30 PM
Last modification on : Tuesday, January 26, 2021 - 10:06:42 AM

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Roland Zino, Raphaël Chosson, Maelig Ollivier, Eric Serris, Loïc Favergeon. Parallel mechanism of growth of the oxide and α-Zr(O) layers on Zircaloy-4 oxidized in steam at high temperatures. Corrosion Science, Elsevier, 2021, 179, pp.109178. ⟨10.1016/j.corsci.2020.109178⟩. ⟨emse-03046188⟩

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