Anodic dissolution model with diffusion-migration transport for simulating localized corrosion

被引:0
作者
Bouguezzi, Meriem [1 ,5 ]
Scheid, Jean-Francois [2 ]
Hilhorst, Danielle [1 ,3 ]
Matano, Hiroshi [4 ]
Bataillon, Christian [3 ]
Lequien, Florence [3 ]
Rouillard, Fabien [3 ]
机构
[1] Univ Paris Saclay, Lab Math Orsay, F-91405 Orsay, France
[2] Univ Lorraine, CNRS, Inria, IECL, Nancy, France
[3] Univ Paris Saclay, CNRS, F-91405 Orsay, France
[4] Meiji Univ, Inst Adv Study Math Sci, 4-21-1 Nakano, Tokyo 1648525, Japan
[5] Univ Paris Saclay, Serv Rech Corros & Comportement Materiaux, CEA, F-91191 Gif sur Yvette, France
关键词
Stefan problem; Free boundary problem; Localized corrosion; Diffusion-migration transport; Finite-difference ALE scheme; PITTING CORROSION; STAINLESS-STEEL; MATHEMATICAL-MODEL; PIT PROPAGATION; CREVICE; EVOLUTION;
D O I
10.1016/j.electacta.2024.143806
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A one-dimensional model for simulating localized corrosion is developed, incorporating a time-dependent diffusion-migration transport and a moving interface. The model is applied to iron with the Butler-Volmer formula as the dissolution law, and both crevice and pit configurations are simulated. The mathematical procedure for solving this strongly coupled differential equations system and the numerical development for simulations are detailed. A finite-difference ALE scheme is used for the numerical computation of the solutions of this free boundary problem. The results show that the dissolution rate increases with chloride concentration and metal potential, and migration plays, most of the time, a significant role in species transport for both crevice and pit configurations. The evolution of the repassivation potential with pit depth is computed and is in good agreement with experimental results. The time-dependent model under consideration provides more accurate quantitative results for concentration profile and crevice depth than stationary models.
引用
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页数:17
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