Properties and corrosion resistance mechanism of octadecylamine microcapsules loaded with epoxy resin
To effectively mitigate the corrosion behaviour of ship components in complex marine environments,self-healing coatings with microcapsules are used in the field of marine corrosion protec-tion.In this paper,microcapsules were made from octadecylamine(ODA)as the core material and hydroxypropyl-β-cyclodextrin(HP-β-CD)as the wall material,and the surface morphology and structure of the microcapsules were characterized.The microcapsules of hydroxypropyl-β-cyclodextrin@octadecylamine(HP-β-CD@ODA)were embedded into the epoxy coating to produce a coating with self-healing function;and the microstructure and corrosion resistance of the self-healing coating were investigated.The results showed that the HP-β-CD@ODA microcapsules were smooth and spherical,and the ODA was completely covered by HP-β-CD,and the coating amount of ODA was 12.7%.The corrosion resistance of the epoxy coating with 10%microcapsule addition was significantly improved compared with that of the carbon steel substrate and the pure epoxy coating specimens,indicating that the self-repairing coating had good corrosion inhibition and could significantly improve the corrosion resistance of the material.