Simulations of Corrosion Processes with Spontaneous Separation of Cathodic and Anodic Reaction Zones

• Autorzy: Vautrin-Ul C. , Chausse A. , Stafiej J. , Badiali J.
• Języki publikacji: EN

Abstrakty

EN

We present a simple cellular automata model for mimicking corrosion processes of corrodable materials covered by an ideal insulating and protective layer.Asmall defect in this layer brings the corrodable material into the contact with the outer environment and initiates the formation of a cavity. We study the evolution of the cavity in terms of time dependence of its size, morphology and chemical composition as determined by the corrosion- passivation phenomena at the corrosion front and diffusion within the cavity.We mimic the diffusion of reaction products as a random walk and we can control the diffusion rate with respect to that of corrosion. If the diffusion is very fast the cavity can be assimilated to a half-circle filled up by a neutral solution. When the diffusion rate decreases the cavity shape becomes more and more irregular and the solution contains large domains essentially acidic or basic comparable to cavity size. A quantitative analysis of simulations also reveals the existence of an incubation time during which the corrosion is not clearly visible. If the diffusion rate is low, the stochastic processes that we have considered lead to an unpredictable shape for the cavity and to a large dispersion of the incubation times. Then we clearly observe spontaneous formation of the cathodic and anodic reaction zones at the corrosion front. We discuss these results in a simple case.

Słowa kluczowe

EN

corrosion modeling; stochastic lattice gas automata

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2004
• Tom: Vol. 78 / nr 9
• Strony: 1795--1810
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Vautrin-Ul C.

• Laboratoire Analyse et Environnement, UMR 8587, Université d'Evry Val d'Essonne, Bd F. Mitterrand, 91025 Evry, France

autor

Chausse A.

• Laboratoire Analyse et Environnement, UMR 8587, Université d'Evry Val d'Essonne, Bd F. Mitterrand, 91025 Evry, France

autor

Stafiej J.

• Institute of Physical Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland

autor

Badiali J.

• Laboratoire d’Electrochimie et de Chimie Analytique, ENSCP et l’Université P. et M. Curie, UMR 7575, 4. Place Jussieu, 75005 Paris, France

Bibliografia

• 1. Landoldt D., Corrosion et Chimie de Surfaces des Métaux, Traité de Matériaux, 12, Presses Universitaires et Polytechniques Romandes, Lausanne 1997.
• 2. Alkire R. and Verthoff M., Electrochim. Acta, 43, 2733 (1998).
• 3. Prediction of Long Term Corrosion Behaviour in Nuclear Waste Systems, Proceedings of the Interna¬tional Workshop, Cadarache, France, European Federation of Corrosion Publications, 36, Féron D. and MacDonald D.D. eds., Maney Publishing 2002.
• 4. Laycock N.J. and White S.P., J. Electrochem. Soc., 148, B264 (2001).
• 5. Meakin P., Jassang T. and Feder J., Phys. Rev. E, 48, 2906 (1993).
• 6. Johnsen T., J0ssang A., Jassang T. and Meakin P., Physica A, 242, 356 (1997).
• 7. Córdoba-Torres P., Nogueira R.P., de Miranda L., Brenig L., Wallenbom J. and Fairén V., Electrochim. Acta, 46, 2975(2001).
• 8. Córdoba-Torres P., Nogueira R.P. and Fairén V., J. Electroanal. Chem., 529, 109 (2002).
• 9. Taleb A.,Chaussé A., Dymitrowska M.,Stafiej J..and Badiali J..P., J. Phys. Chem.B, 108,952(2004).
• 10. Saunier J., Chaussé A., Stafiej J. and Badiali J.P., J. Electroanal. Chem., 563, 239 (2004).
• 11. von Neumann J., Theory of Self Reproducing Automata, University of Illinois Press, Campain IL 1966.
• 12. Chopard B. and Droz M., Cellular Automata Model ing of Physical Systems, Cambridge University ress, 1998.
• 13. Wolfram S., Physica D, 10, 1 (1984).
• 14. Frankel G.S., J. Electrochem. Soc., 145, 2186 (1998).
• 15. Advances in Localized Corrosion, NACE 9, Isaacs H., Bertocci U., Kruger J. and Śmialowska S. eds NACE, Houston, TX, 1990.
• 16. Janik-Czachor M., J Electrochem. Soc., 128, 513 (1981).
• 17. Mańkowski J. and Szklarska-Śmiałowska Z., Corros. Sci., 15, 493 (1975).
• 18. Szklarska-Śmiałowska Z. and Mańkowski J., Corros. Sci., 12, 925 (1972).
• 19. Vautrin-UI C., Chaussé A., Stafiej J. and Badiali J.P. (to be published).