Corrosion resistance self-healing coating with bioinspired interfacial structure

Epoxy coatings peel from substrates when exposed to strong salt spray in marine environments due to the hydrophilic nature of these coatings. In this study, based on the integration of the coating and interface, a corrosion resistant self-healing coating with strong adhesion was formulated using nanocapsules of calcium alginate loaded with tung oil (TO@CA), and a bioinspired and silanized interface was prepared. Bionic interfaces were fabricated based on the strong wet adhesion of the tree frog and inspired by the microstructure of its toe pads. The EIS and pull-off testing results showed that relative to other coatings, the composite coating had the strongest adhesion and provided protection for the longest time. The results of this study have potential application value for improving the adhesion of epoxy coatings in marine environments.