New approach to the kinetic modelling of high temperature corrosion of metals and alloys

Françoise Valdivieso (1, 2, 3) , Michèle Pijolat (1, 2, 3) , Marc Tupin (1, 2, 3) , Karine Surla (1, 2, 3) , Michel Soustelle (1, 2, 3)

1 ProcESS-ENSMSE - Département Procédés et évolution des systèmes avec solides
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires

In this paper we present a new approach for the kinetic modelling of thermal transformations of solids. In the case of the corrosion of metals and alloys, the existence of a rate-limiting step is often assumed, which allows to account for the linear and parabolic kinetic curves (weight gain versus time), corresponding respectively to an interface and diffusion controlling step. But, in many cases, the reaction system is not so simple, thus we have developed a methodology in order to verify experimentally whether the kinetic assumptions of steady state and rate-limiting step can be applied. This is illustrated with two examples, leading to complex kinetic curves: the oxidation by oxygen of an Al-Mg 5% alloy in the liquid state (non reproducible curves), and the oxidation of Zircaloy-4 by water vapour (existence of a kinetic transition).

Mots clés: kinetic modelling; thermal transformations of solids; corrosion; Al-Mg 5% alloy; metals; Zircaloy-4; oxidation; water vapour

Domaines: Génie des procédés

Françoise Valdivieso, Michèle Pijolat, Marc Tupin, Karine Surla, Michel Soustelle. New approach to the kinetic modelling of high temperature corrosion of metals and alloys. 203rd International Meeting of the Electrochemical Society, Apr 2003, Paris, France. ⟨hal-00409913⟩