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Electrochemical Impedance Spectroscopy Study of Waterborne Epoxy Coating Film Formation

1
Helios Tovarna barv, lakov in umetnih smol Kolicevo, d.o.o., Količevo 65, 1230 Domžale, Slovenia
2
Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(4), 254; https://doi.org/10.3390/coatings9040254
Received: 13 March 2019 / Revised: 8 April 2019 / Accepted: 11 April 2019 / Published: 16 April 2019
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Abstract

The film formation process in waterborne (WB) epoxy coatings is studied using electrochemical impedance spectroscopy (EIS) measurements and dynamic mechanical analysis (DMA). Ten epoxy coatings with different pigment volume concentration were prepared on standard steel substrates and carefully monitored over four weeks (30 days). It is shown that impedance spectroscopy can serve as a very sensitive tool for accurate experimental detection of the critical pigment volume concentration. We also show that the optimal film formation process and corrosion stability of coatings are greatly affected by the coating pigment volume concentration (PVC) value. As a whole, the study confirms that the optimization of coating protection ability needs to take into account both maximization of the barrier effect as well as maximization of the degree of epoxy-amino cross-linking. View Full-Text
Keywords: electrochemical impedance spectroscopy; dynamic mechanical spectroscopy; carbon steel; film formation; epoxy curing; waterborne paint coatings electrochemical impedance spectroscopy; dynamic mechanical spectroscopy; carbon steel; film formation; epoxy curing; waterborne paint coatings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Končan Volmajer, N.; Steinbücher, M.; Berce, P.; Venturini, P.; Gaberšček, M. Electrochemical Impedance Spectroscopy Study of Waterborne Epoxy Coating Film Formation. Coatings 2019, 9, 254.

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