2-Mercaptobenzimidazole-inbuilt metal-organic-frameworks modified graphene oxide towards intelligent and excellent anti-corrosion coating. (October 2021)

• Record Type: Journal Article
• Authors: Li, Hao; Qiang, Yujie; Zhao, Wenjie; Zhang, Shengtao
• Is Part Of: Corrosion science. Volume 191(2021)
• Publication Date: 2021-10
• Subjects: 2-Mercaptobenzimidazole -- GO -- ZIF-8 -- Anti-corrosion -- Self-healing; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109715
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: A novel 2-Mercaptobenzimidazole-inbuilt ZIF-8 modified graphene oxide hybrid nanofiller was prepared. M-ZIF-8/GO endowed epoxy coating pH-responsive and self-healing performance. The mechanical properties of the coating were enhanced by M-ZIF-8/GO. M-ZIF-8/GO/EP coating exhibited excellent anti-corrosion over the long-term. Abstract: 2-Mercaptobenzimidazole (M) was successfully inbuilt in zeolitic imidazolate framework-8 (ZIF-8) on GO nanosheets and then imbedded into epoxy coating to prepare composite coating with pH-responsive and self-healing performances. Results showed that M-ZIF-8/GO possessed remarkable pH-triggered activity. The excellent self-healing behavior of M-ZIF-8/GO/EP coating was demonstrated by local electrochemical impedance spectroscopy, which was attributed to the release of corrosion inhibitors that could form a compact protective film on the metal. The anti-corrosion performance of matrix coating was also enhanced effectively because M-ZIF-8/GO could react with epoxy resin which greatly increased the compatibility of M-ZIF-8/GO and the crosslinking density of epoxy coating.