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ANALYSIS OF EN IMPEDANCE SPECTRA FOR DETERMINATION OF CORROSION-RELATED DIFFUSION EFFECT ON BARRIER PROPERTIES OF ZN AND AL PIGMENTED EPOXY COATINGS

1 EREMIÁŠ Boleslav
Co-authors:
1 MINDOŠ Lubomír 1 TUREK Libor
Institution:
1 SVUOM Ltd., Praha, Czech Republic, EU, eremias@svuom.cz
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
711-716
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2021.4170
Published:
15th September 2021
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
364 views / 196 downloads
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Abstract

The effect of different vol. % Zn:Al ratio in Zn and Al pigmented epoxy coatings with the same OPVC (40 vol. %) has been investigated by means of EN measurements performed in 0.05 M NaCl for 168 hrs. Analysis of EN data in frequency domain permits to evaluate changes of the noise impedance spectra due to possible contributions from charge transfer and mass transport reactions occurring in pores filled with corrosion products and at the delaminated areas of tested coatings. The interpretation of EN noise impedance spectra for determination of water penetration and the loss of adhesion in combination with the single frequency (1 kHz) impedance test results for tested coatings has also been discussed.

Keywords: Painting system, Zn pigment, Al pigment, electrochemical noise analysis, delamination of coating

© 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.

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