Investigating the influence of pigmentation on the electrolyte transport properties of organic coatings using ORP-EIS

Negin Madelat*, Benny Wouters, Peter Visser, Zahra Jiryaeisharahi, Kristof Marcoen, Shohsan T. Abrahami, Annick Hubin, Herman Terryn, Tom Hauffman

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


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.

Original languageEnglish
Article number111699
Number of pages15
JournalCorrosion Science
Publication statusPublished - 2024

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project
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.


Funding Information:
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


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