The objective of this work is to develop and evaluate experimental approaches with different analytical techniques to measure the permeability, diffusivity, and solubility of water in model coatings. These properties are of primary relevance in studies of coatings for corrosion protection. For water permeation measurements, setups were designed and prepared to facilitate measurements by microcalorimetry, gravimetry, and thermogravimetric analysis. For sorption measurements, films were prepared in various thicknesses to allow a proper analysis with Fourier-transform infrared spectroscopy in transmission mode and gravimetry. Both methods are successful in following water uptake kinetic curves, being complementary in film thickness ranges that can be analyzed. The validity of the permeabilities calculated from permeation measurements is compared to results from group contribution methods and reported values in the literature. Diffusivities were determined using data from the transient region in sorption and permeation measurements, as well as from the steady-state permeation rate and equilibrium solubility in permeation and sorption measurements, respectively.
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The authors would like to thank ir. R. Claessens (Vrije Universiteit Brussel) for his kind help in developing instrument accessories and Dr. P. Visser (AkzoNobel Expertise Center Corrosion) for his support of this research. This work is part of the PredictCor project that focuses on the development of a Knowledge and Technology Platform for Prediction of Durability and Lifetime of Organic Coated Metals under Long-term Environmental Corrosion, a project supported by FWO-Vlaanderen (S000718N).
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Jalilian, E., Terryn, H. & Van Assche, G. Water permeation in coatings. J Coat Technol Res 17, 1437–1445 (2020). https://doi.org/10.1007/s11998-020-00377-6