Preparation and Investigation of Hybrid Self-Healing Coatings Containing Sub-Micron Capsules and Anticorrosion Agent on Steel Surface

In this study, the effectiveness of hybrid epoxy and polyurethane self-healing coatings filled with Linseed oil loaded sub-micron capsules and Benzotriazole as an anticorrosion agent on steel films was investigated. The characteristics of the prepared capsules were perused through FT-IR, FESEM, and TGA techniques for chemical structure, morphology, and thermal stability, respectively. Furthermore, the size distribution of synthesized nanocapsules was studied with DLS technique. The corrosion resistance efficiency of the prepared coatings was investigated with EIS and optical microscopy imaging. In order to reduce the number of experiments and analyzing the obtained data, Taguchi design of experiments and data analysis was used. 52.59% of the encapsulated linseed oil was calculated. The core-shell structure of the capsules was affirmed with FT-IR. The spherical structure and the surface of the capsules were investigated using FESEM technique. The thermal stability of the capsules was determined at about 200°C through TGA. The sizes of the synthesized capsules were determined at about 459 to 719 nm with DLS technique. The better performance of hybrid coatings was confirmed with EIS. The occurrence of self-healing in the place of the scratch was observed using optical microscopy.