The chemical throwing power of lithium-based inhibitors from organic coatings on AA2024-T3
P. Visser (TU Delft - (OLD) MSE-6, AkzoNobel)
K. Marcoen (Vrije Universiteit Brussel)
G. F. Trindade (University of Surrey)
M. L. Abel (University of Surrey)
J. F. Watts (University of Surrey)
T. Hauffman (Vrije Universiteit Brussel)
J. M.C. Mol (TU Delft - (OLD) MSE-6)
H. Terryn (Vrije Universiteit Brussel, TU Delft - (OLD) MSE-6)
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Abstract
Chemical throwing power, being the distance over which an inhibitor is able to protect a defect effectively, is an important parameter for active protective coatings. This study investigates the chemical throwing power of lithium-based leachable corrosion inhibitors exhibiting different leaching kinetics, from coatings at different inhibitor loading concentrations. The results demonstrate that Li-salt loaded coatings provide corrosion protection of defect areas up to a width of 6 mm. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to detect the lateral spread of Li in the defect areas and provide the chemical speciation of corrosion protective layers in the defect areas.