Superabsorbent polymer additives for repeated barrier restoration of damaged powder coatings under wet-dry cycles: A proof-of-concept

Vimal Saini, Max von Tapavicza, Christina Eloo, Katrin Braesch, Holger Wack, Anke Nellesen, Annette M. Schmidt, Santiago J. García

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
17 Downloads (Pure)

Abstract

Superabsorbent polymers (SAPs) are well known for their ability to absorb and hold high water amounts accompanied by a high volume expansion. In this work we show the benefits of this underlying property of SAPs to induce underwater crack closure with subsequent barrier restoration in damaged protective coatings. For the proof of concept, three layer epoxy-polyester (EP) powder coating systems were developed and applied on carbon steel. In these systems the middle EP layer (also called functional layer) contained crosslinked acrylamide/acrylic acid copolymer SAPs in different amounts ranging from 0 to 40 wt%. The capability of the SAPs to close damages and extend barrier and corrosion protection was evaluated by electrochemical impedance spectroscopy (EIS), NaCl aqueous solution immersion test and optical microscopy. It was found that coatings loaded with a 20 wt% SAP led to the best overall corrosion protection for the studied systems. In order to proof the potential use of this extrinsic healing concept for multiple healing events wet-dry cycles on scratched systems were performed and the corrosion performance was followed by EIS. Although not yet optimal, the results show the potential of the concept for multiple healing events under wet-dry conditions.

Original languageEnglish
Pages (from-to)129-137
Number of pages9
JournalProgress in Organic Coatings
Volume122
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Corrosion inhibition
  • Electrochemical impedance spectroscopy
  • Powder coating
  • Self-healing
  • Superabsorbent polymer

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