Etude de la compétition entre corrosion uniforme et localisée par automates cellulaires

Abstract : Numerical modelling is complementary tool for corrosion prediction. The objective of this work is to develop a corrosion model by means of a probabilistic cellular automata approach at a mesoscopic scale. In this work, we study the morphological evolution and kinetics of corrosion. This model couples electrochemical oxydation and reduction reactions. Regarding kinetics, cellular automata models are able to describe current as a function of the applied potential for a redox reaction on an inert electrode. The inclusion of probabilities allows the description of the stochastic nature of anodic and cathodic reactions. Corrosion morphology has been studied in different context: generalised corrosion, pitting corrosion and corrosion in an occluded environment. A general tendency of two regimes is found. A first regime of uniform corrosion where the anodic and cathodic reactions occur homogeneously over the surface. A second regime of localized corrosion when there is a spatial separation of anodic and cathodic zones, with an increase of anodic reaction rate.
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Cristian Felipe Pérez Brokate. Etude de la compétition entre corrosion uniforme et localisée par automates cellulaires. Chimie analytique. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066650⟩. ⟨tel-01561596⟩

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