FEM modelling to predict spatiotemporally resolved water uptake in organic coatings

FEM modelling to predict spatiotemporally resolved water uptake in organic coatings: Experimental validation by odd random phase electrochemical impedance spectroscopy measurements

Meeusen, M. (Vrije Universiteit Brussel)
van Dam, J.P.B. (TU Delft Team Yaiza Gonzalez Garcia)
Madelat, N. (Vrije Universiteit Brussel)
Jalilian, E. (Vrije Universiteit Brussel)
Wouters, B. (Vrije Universiteit Brussel)
Hauffman, T. (Vrije Universiteit Brussel)
Van Assche, G. (Vrije Universiteit Brussel)
Mol, J.M.C. (TU Delft Team Arjan Mol)
Hubin, A. (Vrije Universiteit Brussel)
Terryn, H.A. (Vrije Universiteit Brussel)

2023

In this work, a new finite element modelling (FEM) approach is followed to model spatiotemporally resolved water uptake in organic coatings. To this aim, we start from a physical model, where not only Fickian diffusion of water is taken into account but also the adsorption/desorption reaction of water on the polymer matrix. Starting from a number of important coating properties and crucial model parameters, derived from gravimetric and Fourier transform infrared (FTIR) measurements as the model input, the local water concentration over the coating thickness as a function of time is modelled for a polyethylene glycol diacrylate (PEGDA) coating. The modelled water concentration is then used to calculate virtual capacitance values which are evaluated against experimental capacitance values extracted from impedance measurements. The constraints of the FEM model and ORP-EIS experiments and the discrepancies between them are critically discussed in order to carry out a meaningful model validation, eventually leading to model improvements.

Coatings
Comsol Multiphysics
FEM
Impedance
Water transport

http://resolver.tudelft.nl/uuid:def73f14-b697-4014-9ae2-66108294c43c

https://doi.org/10.1016/j.porgcoat.2023.107710

2023-12-03

0300-9440

Progress in Organic Coatings, 182

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2023 M. Meeusen, J.P.B. van Dam, N. Madelat, E. Jalilian, B. Wouters, T. Hauffman, G. Van Assche, J.M.C. Mol, A. Hubin, H.A. Terryn