Study on the Self-Repairing Effect of Nanoclay in Powder Coatings for Corrosion Protection
Source abstract
Abstract
Powder coatings are a promising, solvent-free alternative to traditional liquid coatings due to the superior corrosion protection they provide. This study investigates the effects of incorporating montmorillonite-based nanoclay additives with different particle sizes into polyester/triglycidyl isocyanurate (polyester/TGIC) powder coatings. The objective is to enhance the corrosion-protective function of the coatings while addressing the limitations of commonly employed epoxy-based coating systems that exhibit inferior UV resistance. The anti-corrosive and surface qualities of the coatings were evaluated via neutral salt spray tests, electrochemical measurements, and surface analytical techniques. Results show that the nanoclay with a larger particle size of 18.38 µm (D50, V) exhibits a better barrier effect at a lower dosage of 4%, while a high dosage leads to severe defects in the coating film. Interestingly, the coating capacitance is found, via electrochemical impedance spectroscopy, to decrease during the immersion test, indicating a self-repairing capability of the nanoclay, arising from its swelling and expansion. Neutral salt spray tests suggest an optimal nanoclay dosage of 2%, with the smaller particle size (8.64 µm, D50, V) nanoclay providing protection for 1.5 times as many salt spray hours as the nanoclay with a larger particle size. Overall, incorporating montmorillonite-based nanoclay additives is suggested to be a cost-effective approach for significantly enhancing the anti-corrosive function of powder coatings, expanding their application to outdoor environments.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Polymer Nanocomposites and Properties · Corrosion Behavior and Inhibition · Polymer composites and self-healing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada
Department of Chemistry, Western University, London, ON N6A 5B7, Canada
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
Surface Science Western, Western University, London, ON N6G 0J3, Canada
Department of Statistical and Actuarial Sciences, Western University, London, ON N6A 5B7, Canada
Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Funding
Natural Sciences and Engineering Research Council of Canada (NSERC) · Canada Research Chairs Program · Wolfe–Western Fellowship
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