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Coatings 2018, 8(3), 98; https://doi.org/10.3390/coatings8030098

Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media

1
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb 10002, Croatia
2
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb 10002, Croatia
*
Author to whom correspondence should be addressed.
Received: 13 February 2018 / Revised: 6 March 2018 / Accepted: 7 March 2018 / Published: 8 March 2018
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Abstract

Protective coatings are the most widely used corrosion protection method for construction materials in different environmental conditions. They isolate metals from aggressive media, making the structure more durable. Today, alongside good anti-corrosive properties, coatings need to be safe for the environment and harmless to those who apply them. The high volatile organic compound (VOC) content in conventional solvent-borne coatings presents a huge ecological problem. A solution for indispensable solvent emission reduction is the application of powder coatings. This study evaluates the corrosion performance and surface morphology of polyester and epoxy–polyester powder coatings. Electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) measurement, salt spray chamber and humidity chamber testing followed by adhesion testing were used to investigate the protective properties of powder coatings. Scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDX) was used to analyse the surface morphology and chemical composition, whereas the microstructure and coating uniformity were determined by optical microscope examination. The research revealed a negative influence of coating surface texture on coating thickness and consequently a lack of barrier and adhesion properties. The epoxy–polyester powder coating showed a better performance than the polyester coating. All tested coatings showed uniform structure. View Full-Text
Keywords: electrostatic spraying; powder coatings; corrosion performance; EIS study; SEM analysis electrostatic spraying; powder coatings; corrosion performance; EIS study; SEM analysis
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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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Stojanović, I.; Šimunović, V.; Alar, V.; Kapor, F. Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media. Coatings 2018, 8, 98.

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