Monte Carlo simulation of uniform corrosion process under potentiostatic conditions |
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Authors: | S Guessasma O Elkedim R Hamzaoui |
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Affiliation: | a INRA, unite BIA, Rue de la Gèraudière, Nantes 44130, France b FEMTO ST, UMR CNRS 6174, UTBM, Site de Sévenans, F90010 Belfort, France c FEMTO ST - CREST, I.U.T. de Belfort-Montbeliard, 90016 Belfort, France d Groupe Nanomatériaux, UMR CNRS 5060, UTBM, F90010 Belfort cedex, France e LETAM, UMR CNRS 7078, Université de Metz, Ile du Saulcy, 57045 Metz, France |
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Abstract: | The aim of this paper is to study the corrosion resistance of industrial coatings of metallic alloys including certain amount of process-induced porosity. Surface damages during a simulated corrosion process are investigated using Monte Carlo simulation technique and compared to corrosion response (dissolution currents). In this simulation, a 3D grid of the coating is subject to an electrolyte attack under potentiostatic conditions. The surface damages are related to a controlled dissolution process governed by dissolution probability, roughness, porosity size and fraction. In order to validate the model results, theoretical I = f(t) curves are compared to corrosion behaviour of Fe-40Al samples pointing out critical parameters affecting current density and exposed area. Predictions relating the porosity level to corrosion behaviour are established and discussed. The main conclusions focus on a primary effect of pore size and connectivity and a secondary effect of porosity level in the considered process window (porosity levels between 5.8% and 7.8%). The experimental work shows that the porosity effect could not explain all observed trends and a deeper examination of the microstructure reveals another candidate (unmolten particles) which is expected to vary both pore connectivity and dissolution events. |
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Keywords: | A Alloy A Metal coatings B Modelling studies B Potentiostatic |
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