Chemisorption of polyester coatings on zirconium-based conversion coated multi-metal substrates and their stability in aqueous environment

L. I. Fockaert, S. Pletincx, D. Ganzinga-Jurg, B. Boelen, T. Hauffman, H. Terryn, J. M.C. Mol

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Abstract

In this work, in-situ ATR-FTIR in the Kretschmann configuration is proposed as an interfacial sensitive technique able to probe molecular processes at the buried interface of an industrial relevant polyester primer. Zinc, aluminium and magnesium oxide were used to represent oxides present at galvanized steel sheets used in coil coating. Two competing interactions with polyester resin and melamine-based crosslinker were shown to take place at metal hydroxide sites. This highlights the increased complexity of interfacial phenomena at metal–paint interfaces. Furthermore, in-situ ATR-FTIR was performed in deuterated water (D2O) to study the evolution of interfacial carboxylate bond degradation, without overlap of dominant water signals. For the first time, interfacial bond formation of paints and its degradation in an aqueous environment is studied in-situ. It is shown that the introduction of D2O at the interface initially increases the amount of interfacial carboxylate bonds, whereas upon longer exposure times bond degradation occurs. Significant delay of interfacial bond degradation on hexafluorozirconic acid treated oxides indicate successful stabilization of the metal-polymer interface by zirconium-based conversion coatings. Consequently, in-situ ATR-FTIR is able to demonstrate improved interfacial stability due to zirconium-based treatment in real-time and on a molecular level.

Original languageEnglish
Article number144771
JournalApplied Surface Science
Volume508
DOIs
Publication statusPublished - 1 Apr 2020

Bibliographical note

Funding Information:
This research was carried out under project number F81.3.13509 in the framework of the Partnership Program of the Materials innovation institute M2i (www.m2i.nl) and the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organisation for Scientific Research NWO (www.nwo.nl). S.P. would like to acknowledge financial support by Research Foundation-Flanders (FWO) under project number SB-19-151. The authors would also like to acknowledge Gavin Scott from AkzoNobel for the primer formulations.

Funding Information:
This research was carried out under project number F81.3.13509 in the framework of the Partnership Program of the Materials innovation institute M2i (www.m2i.nl) and the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organisation for Scientific Research NWO (www.nwo.nl). S.P. would like to acknowledge financial support by Research Foundation-Flanders (FWO) under project number SB-19-151 . The authors would also like to acknowledge Gavin Scott from AkzoNobel for the primer formulations.

Publisher Copyright:
© 2019 The Authors

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • Chemisorption
  • Coil coating
  • In situ ATR-FTIR
  • Metal-polymer interface
  • Polyester primer

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