Title: Contribution of cellular automata to the understanding of corrosion phenomena
Author(s):

	M. Zenkri (LPC2M, IPEST, Route Sidi Bou Said, B.P:51 2075 La Marsa, Tunisie; Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), Paris; Faculté des Sciences de Bizerte, 7021 Jarzouna, Université de Carthage, Tunisie) ,
	D. di Caprio (Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), Paris) ,
	C. Pérez-Brokate (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, Gif-sur-Yvette, France) ,
	D. Féron (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, Gif-sur-Yvette, France; Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, UMR 8587, CNRS-CEA-Université d'Evry Val d'Essonne, France) ,
	J. de Lamare (Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, Gif-sur-Yvette, France) ,
	A. Chaussé (Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, UMR 8587, CNRS-CEA-Université d'Evry Val d'Essonne, France) ,
	F. Ben Cheikh Larbi (LPC2M, IPEST, Route Sidi Bou Said, B.P:51 2075 La Marsa, Tunisie; Faculté des Sciences de Bizerte, 7021 Jarzouna, Université de Carthage, Tunisie) ,
	F. Raouafi (LPC2M, IPEST, Route Sidi Bou Said, B.P:51 2075 La Marsa, Tunisie; Faculté des Sciences de Bizerte, 7021 Jarzouna, Université de Carthage, Tunisiess)

We present a stochastic CA modelling approach of corrosion based on spatially separated electrochemical half-reactions, diffusion, acido-basic neutralization in solution and passive properties of the oxide layers. Starting from different initial conditions, a single framework allows one to describe generalised corrosion, localised corrosion, reactive and passive surfaces, including occluded corrosion phenomena as well. Spontaneous spatial separation of anodic and cathodic zones is associated with bare metal and passivated metal on the surface. This separation is also related to local acidification of the solution. This spontaneous change is associated with a much faster corrosion rate. Material morphology is closely related to corrosion kinetics, which can be used for technological applications.

Key words: electrochemistry, corrosion, localized corrosion, passivation, cellular automata
PACS: 82.45.-h, 82.45.Bb, 07.05.Tp, 82.20.Pm

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