Self-healing properties of protective coatings containing isophorone diisocyanate microcapsules on carbon steel surfaces |
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| Affiliation: | 1. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), 149-1 Zhuzhou Road, Laoshan District, Qingdao 266101, PR China;2. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China;1. Functional Interfaces Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary;2. Óbuda University, Rejtő Sándor Faculty of Light Industry and Environmental Engineer, Institute of Media-technology and Light Industry, Doberdó út 6, Budapest H-1034, Hungary |
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| Abstract: | Microcapsules containing isophorone diisocyanate (IPDI) were used as self-healing additives in the alkyd varnish coatings (AVCs), and their self-healing performance was evaluated in the case of artificial defects on Q235 steel surfaces, using scanning micro-reference electrode technique and Fourier-transform infrared spectroscopy. Comparison of the micromechanical properties between the water-insoluble self-healing products (polyurethanes) and AVCs indicates that the former significantly enhanced the capability of the scratched crevice to successfully endure outer stress. The electrochemical impedance spectroscopy experiments analysed the different stages in the self-healing process. This study successfully demonstrated the self-healing activity of IPDI-AVCs in protecting steel surfaces. |
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| Keywords: | A Carbon steel A Organic coatings B EIS |
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