Corrosion protection in a coating defect on AA2024-T3 by lithium carbonate inhibitor leaching

An experimentally validated FEM approach

Journal article (2025)

Authors

N. Abdelrahman Vrije Universiteit Brussel
Nils Van den Steen Vrije Universiteit Brussel
C. Özkan Team Arjan Mol
Peter Visser Akzo Nobel
S. V. Lamaka Helmholtz-Zentrum Hereon
R. Böttcher Airbus Central Research and Technology
J. M C Mol Team Arjan Mol
HA Terryn Team Arjan Mol, Vrije Universiteit Brussel
T. Hauffman Vrije Universiteit Brussel
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Research Group
Team Arjan Mol
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Published Date

2025

Language

English

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Research Group

Team Arjan Mol

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.

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