Corrosion protection in a coating defect on AA2024-T3 by lithium carbonate inhibitor leaching
An experimentally validated FEM approach
N. Abdelrahman (Vrije Universiteit Brussel)
N. Van den Steen (Vrije Universiteit Brussel)
C. Özkan (TU Delft - Team Arjan Mol)
P. Visser (Akzo Nobel)
S. V. Lamaka (Helmholtz-Zentrum Hereon)
R. Böttcher (Airbus)
J. M.C. Mol (TU Delft - Team Arjan Mol)
H. Terryn (Vrije Universiteit Brussel, TU Delft - Team Arjan Mol)
T. Hauffman (Vrije Universiteit Brussel)
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Abstract
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.