期刊
PROCESSES
卷 10, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/pr10091853
关键词
powder coatings; polyester; zinc-rich; anti-corrosive; pigment; sacrificial anode; galvanic; barrier; EIS; electrochemical impedance spectroscopy
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant [RGPIN-2018-06256]
- NSERC [RGPIN-2018-06672]
Powder coatings are an environmentally friendly alternative with various advantageous properties. This study compares the corrosion performance of polyester powder coatings with different zinc contents and observes the behavior and characteristics of the coatings. The results demonstrate that coatings with 80% zinc exhibit superior anti-corrosive properties.
Powder coatings represent an environmentally friendly VOC-free alternative to widely used solvent-borne zinc-rich coatings, with economic and ecological benefits. In particular, powder coatings have several advantageous properties, such as chemical resistance and mechanical strength. However, the performance and characteristics of polyester-based zinc-containing powder coatings remain unknown. In this study, the corrosion performance of polyester powder coatings containing up to 80% zinc is compared. Electrochemical and salt-spray testing results indicate that coatings formulated with 80% zinc demonstrate superior anti-corrosive properties than coatings with lower zinc dosages. Two distinct behavioral phases of the coating with 80% zinc were observed by measurements of open circuit potential (OCP) and polarization resistance (R-p) during immersion tests-a phase indicative of a barrier effect and a phase consistent with galvanic protection. The evolution of the coating was further characterized and interpreted as five stages by electrochemical impedance spectroscopy (EIS), and the mechanistic details were discussed. This UV-resistant single-layer powder coating has the potential to replace the commonly used high-VOC multi-layer liquid coating systems at a significantly lower cost.
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