Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media
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 e...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-03-01
|
Series: | Coatings |
Subjects: | |
Online Access: | http://www.mdpi.com/2079-6412/8/3/98 |
id |
doaj-b96bc133792a4b54b8e6498ac16dd42f |
---|---|
record_format |
Article |
spelling |
doaj-b96bc133792a4b54b8e6498ac16dd42f2020-11-24T22:37:42ZengMDPI AGCoatings2079-64122018-03-01839810.3390/coatings8030098coatings8030098Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive MediaIvan Stojanović0Vinko Šimunović1Vesna Alar2Frankica Kapor3Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb 10002, CroatiaFaculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb 10002, CroatiaFaculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb 10002, CroatiaFaculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb 10002, CroatiaProtective 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.http://www.mdpi.com/2079-6412/8/3/98electrostatic sprayingpowder coatingscorrosion performanceEIS studySEM analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ivan Stojanović Vinko Šimunović Vesna Alar Frankica Kapor |
spellingShingle |
Ivan Stojanović Vinko Šimunović Vesna Alar Frankica Kapor Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media Coatings electrostatic spraying powder coatings corrosion performance EIS study SEM analysis |
author_facet |
Ivan Stojanović Vinko Šimunović Vesna Alar Frankica Kapor |
author_sort |
Ivan Stojanović |
title |
Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media |
title_short |
Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media |
title_full |
Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media |
title_fullStr |
Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media |
title_full_unstemmed |
Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media |
title_sort |
experimental evaluation of polyester and epoxy–polyester powder coatings in aggressive media |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2018-03-01 |
description |
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. |
topic |
electrostatic spraying powder coatings corrosion performance EIS study SEM analysis |
url |
http://www.mdpi.com/2079-6412/8/3/98 |
work_keys_str_mv |
AT ivanstojanovic experimentalevaluationofpolyesterandepoxypolyesterpowdercoatingsinaggressivemedia AT vinkosimunovic experimentalevaluationofpolyesterandepoxypolyesterpowdercoatingsinaggressivemedia AT vesnaalar experimentalevaluationofpolyesterandepoxypolyesterpowdercoatingsinaggressivemedia AT frankicakapor experimentalevaluationofpolyesterandepoxypolyesterpowdercoatingsinaggressivemedia |
_version_ |
1725715923488210944 |