In this work, the correlation between electrolyte transport properties and the variation of pigment volume concentration (PVC) in a series of organic coatings is explored. Using an odd random phase electrochemical impedance spectroscopy (ORP-EIS) approach, the diffusion of ions independent from water take-up is analysed. A higher PVC resulted in a more homogeneous coating morphology, which could be associated with a faster diffusion of ions following a Fickian regime and enhanced water uptake. In the case of lower pigment loading, the obtained heterogenous morphology of the coating introduced new challenges to the physical interpretation of the proposed electrochemical equivalent circuit.
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This research is funded by the SBO project PredictCor (project number: FWOSBO22) of the Research Foundation – Flanders (FWO). Special thanks go to OCAS for their help with GDOES measurements and Priya Laha from Vrije Universiteit Brussel for SEM measurements.
- Ion diffusion
- Organic coating
- Water uptake