Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media
Source abstract
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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Smart Materials for Construction · Concrete Corrosion and Durability
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb 10002, Croatia
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb 10002, Croatia
References (23)
Show source-provided references
1. Electrostatic powder coating of foods–State of the art and opportunities10.1016/j.jfoodeng.2012.02.002 ↗
2. Improved functionality of food additives with electrostatic coating10.1016/j.ifset.2006.02.003 ↗
3. Numerical investigation of coarse powder and air flow in an electrostatic powder coating process10.1016/j.powtec.2006.02.002 ↗
4. Dry coating, a novel coating technology for solid pharmaceutical dosage forms10.1016/j.ijpharm.2008.03.028 ↗
5. Effect of curing characterization on the corrosion performance of polyester and polyester/epoxy powder coatings10.1016/j.corsci.2008.08.037 ↗
6. Influences of different powders on the characteristics of particle charging and deposition in powder coating processes10.1016/j.elstat.2009.01.044 ↗
7. Effects of IR pre-curing conditions on wear resistance of metal flake powder coatings10.1016/j.porgcoat.2010.11.007 ↗
8. A new UV-curable powder coating based on a α,ω-unsaturated copolyamide 6/11/1210.1016/j.eurpolymj.2009.03.023 ↗
9. Corrosion Study of Powder-Coated Galvanised Steel10.1155/2013/464710 ↗
10. (2007). ISO 2808 Paints and Varnishes—Determination of Film Thickness, International Organization for Standardization.
11. (2013). ISO 2409 Paints and Varnishes—Cross-Cut Test, International Organization for Standardization.
12. Influence of Drying Temperature on Protective Properties of Waterborne and Solventborne Epoxy Coatings10.1016/S1452-3981(23)07943-9 ↗
13. Evaluation of the corrosion resistance of an epoxy-polyamide coating containing different ratios of micaceous iron oxide/Al pigments10.1016/j.corsci.2011.01.045 ↗
14. (2017). ISO 9227 Corrosion Tests in Artificial Atmospheres—Salt Spray Tests, International Organization for Standardization.
15. (2017). ISO 6270-2 Paints and Varnishes—Determination of Resistance to Humidity—Part 2: Condensation (In-Cabinet Exposure with Heated Water Reservoir), International Organization for Standardization.
16. (2016). ISO 4628 Paints and Varnishes—Evaluation of Degradation of Coatings—Designation of Quantity and Size of Defects, and of Intensity of Uniform Changes in Appearance, International Organization for Standardization.
17. Application of EIS and SEM to evaluate the influence of pigment shape and content in ZRP formulations on the corrosion prevention of naval steel10.1016/S0010-938X(01)00144-5 ↗
18. EIS studies of coated metals in accelerated exposure10.1016/S0300-9440(02)00222-9 ↗
19. EIS study on failure process of two polyurethane composite coatings10.1016/j.porgcoat.2010.04.017 ↗
20. In situ electrochemical studies of forming-induced defects of organic coatings on galvanised steel10.1016/j.electacta.2009.01.003 ↗
21. EIS examination of mill scale on mild steel with polyester–epoxy powder coating10.1016/j.porgcoat.2004.01.006 ↗
22. Jakovljević, S., Alar, V., and Ivanković, A. (2017). Electrochemical Behaviour of PACVD TiN-Coated CoCrMo Medical Alloy. Metals, 7.10.3390/met7070231 ↗
23. A method for polymethymetacrylate coating via self-curable unsaturated polyester primer on metal and glass surfaces10.1016/j.porgcoat.2007.06.005 ↗