LAPSE:2023.1863v1
Published Article
LAPSE:2023.1863v1
A Mechanistic Study on the Anti-Corrosive Performance of Zinc-Rich Polyester/TGIC Powder Coatings
February 21, 2023
Abstract
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 (Rp) 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.
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 (Rp) 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.
Record ID
Keywords
anti-corrosive, barrier, EIS, electrochemical impedance spectroscopy, galvanic, pigment, polyester, powder coatings, sacrificial anode, zinc-rich
Subject
Suggested Citation
Yang MS, Huang J, Noël JJ, Chen J, Barker I, Henderson JD, Zhang H, Zhang H, Zhu J. A Mechanistic Study on the Anti-Corrosive Performance of Zinc-Rich Polyester/TGIC Powder Coatings. (2023). LAPSE:2023.1863v1
Author Affiliations
Yang MS: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada [ORCID]
Huang J: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada [ORCID]
Noël JJ: Department of Chemistry, Western University, London, ON N6A 5B7, Canada [ORCID]
Chen J: Department of Chemistry, Western University, London, ON N6A 5B7, Canada; Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [ORCID]
Barker I: Surface Science Western, Western University, London, ON N6G 0J3, Canada
Henderson JD: Surface Science Western, Western University, London, ON N6G 0J3, Canada [ORCID]
Zhang H: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada
Zhang H: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Zhu J: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada [ORCID]
Huang J: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada [ORCID]
Noël JJ: Department of Chemistry, Western University, London, ON N6A 5B7, Canada [ORCID]
Chen J: Department of Chemistry, Western University, London, ON N6A 5B7, Canada; Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [ORCID]
Barker I: Surface Science Western, Western University, London, ON N6G 0J3, Canada
Henderson JD: Surface Science Western, Western University, London, ON N6G 0J3, Canada [ORCID]
Zhang H: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada
Zhang H: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Zhu J: Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada [ORCID]
Journal Name
Processes
Volume
10
Issue
9
First Page
1853
Year
2022
Publication Date
2022-09-14
ISSN
2227-9717
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Original Submission
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PII: pr10091853, Publication Type: Journal Article
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LAPSE:2023.1863v1
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https://doi.org/10.3390/pr10091853
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Feb 21, 2023
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