A performance and eco-friendly bio-inspired waterborne anti-corrosion composite coating by low-defect PDA@g-C3N4 nanosheets

PROGRESS IN ORGANIC COATINGS(2024)

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Abstract
Due to the low volatile organic compound (VOC) emissions, waterborne coatings are gaining much attention. However, the weak barrier properties prevent them from being practical. In this study, a novel well-dispersed low-defective the g-C3N4 nanosheets are successfully prepared using urea and polydopamine, followed by the preparation of an extensible bio-inspired coating. The bio-inspired coating comprises of PDA@g-C3N4 nanosheets that are oriented and possess zigzag channels, rendering them impervious to corrosion factors. Electrochemical tests have demonstrated that the bio-inspired coating displays a substantially improved resistance of 1.18 x 1010 0 cm2, surpassing the pure epoxy coating (6.77 x 107 0 cm2) by three orders of magnitude. Moreover, the excellent corrosion resistance of the bio-inspired coating has been substantiated through salt spray tests. The development of bio-inspired composite coatings presents a novel avenue for investigating the synthesis of waterborne epoxy coatings with exceptional performance.
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Key words
Low-defect PDA@g-C 3 N 4,Oriented structure,Bio-inspired coating,Anti-corrosion,Environment-friendly
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