Corrosion protection in a coating defect on AA2024-T3 by lithium carbonate inhibitor leaching: An experimentally validated FEM approach

作者：Nourhan Abdelrahman, Nils Van den Steen, Can Özkan, Cheng Wang, Ci Song, Peter Visser, Sviatlana V. Lamaka, Silvar Kallip, René Böttcher, J.M.C. Mol, Mikhail L. Zheludkevich, Herman Terryn, Tom Hauffman, Mats Meeusen · 发表于：Corrosion Science · 年份：2025 · DOI：10.1016/j.corsci.2025.112861 · 被引用次数：6 · 研究领域：Corrosion Behavior and Inhibition、Non-Destructive Testing Techniques、Concrete Corrosion and Durability

A 2D finite element model is developed to simulate the protection of active protective coatings in a defect. The leaching kinetics, inhibitor-electrolyte reactions and electrochemical surface reactions on homogenized AA2024-T3, are considered. Changes in local oxygen distribution, pH, and current density over time are validated using surface scanning micro-probe techniques. The limitations posed by the prediction of surface current density at the metal interface using a FEM model with a homogenized microstructure are identified and addressed. The validated FEM is then used to predict inhibitor concentration and pH dependent on the initial inhibitor pigment concentration in an organic coating .