Mesoscopic Modeling Of Corrosion Processes:
Pitting Morphology Evolution
Author(s)
A. Taleb, C. Vautrin-Ul, H. Mendy, J. Stafiej & A. Chausse
Abstract
We use cellular automata simulations at a mesoscopic scale to describe the
phenomenon governing the morphology of pitting corrosion. We show that
spontaneous separation of anodic and cathodic reaction zones plays a major role
in determining the shape of the corroded space. The location of these zones
versus the corroded surface is a stochastic event that influences strongly the
direction of the corrosion propagation.
Keywords: cellular automata, corrosion, pitting morphology.
1 Introduction
The corrosion phenomena lead to a strong modification of the metal surface
properties. Both physical and chemical aspects of the surface are affected by this
change. Depending on the corrosive environment properties in terms of pH,
temperature, aggressive ion concentration and potential, the metal surface is
covered by an oxide film or not. In certain conditions, the presence of the film
leads to a passivation of the surface that is separation of the corrosive media
from the metal greatly reducing the rate of corrosion. The local breakdown of
this protecting layer induces local corrosion named pitting corrosion or crevice
corrosion if the site is occluded.
Keywords
cellular automata, corrosion, pitting morphology.
Related Book
Other papers in this volume
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