Differentiating between the diffusion of water and ions from aqueous electrolytes in organic coatings using an integrated spectro-electrochemical technique

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Abstract

In this work, the separate diffusion of water and ions through a polyethylene glycol diacrylate (PEGDA) coating was characterized using an integrated spectro-electrochemical technique. The ions ingress front position profile along the thickness of the coating was derived from fitting odd random phase electrochemical impedance spectroscopy (ORP-EIS) data using a physically relevant electrochemical equivalent circuit (EEC). The arrival time of the ions at the coating/metal oxide buried interface obtained from EEC and rapid uptake of water was verified using in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) measurements in Kretschmann geometry integrated in the ORP-EIS set-up.

Original languageEnglish
Article number110919
JournalCorrosion Science
Volume212
DOIs
Publication statusPublished - Mar 2023

Bibliographical note

Funding Information:
This research is funded by the SBO project PredictCor (project number: FWOSBO22) of the Research Foundation – Flanders (FWO).

Publisher Copyright:
© 2022 Elsevier Ltd

Copyright:
Copyright 2023 Elsevier B.V., All rights reserved.

Keywords

  • ATR-FTIR in Kretschmann geometry
  • Buried interfaces
  • Ion diffusion
  • Organic coatings
  • ORP-EIS
  • Spectro-electrochemical technique

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