pH-responsive self-healing anticorrosion coatings based on benzotriazole-containing zeolitic imidazole framework

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2019-01, Vol.561, p.1-8
• Main Authors: Guo, Yugao, Wang, Jie, Zhang, Dawei, Qi, Tao, Li, Guo Liang
• Format: Article
• Language: English
• Subjects: Anticorrosion; pH-responsive; Self-healing coatings; Zeolitic imidazole framework
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2018.10.044

[Display omitted] Utilization of self-healing nanocontainers with corrosion inhibitors is an efficient strategy for protecting metals from corrosion. However, self-healing coatings require the rapid release of these corrosion inhibitors to achieve an on-demand barrier on metal surface while avoiding unwanted leakage before the protective coatings are damaged. Herein, well-defined ZIF-7@BTA nanoparticles with approximately 30 wt% benzotriazole inhibitors are prepared via a ligand exchange approach. The as-synthesized ZIF-7@BTA nanoparticles can rapidly release the BTA inhibitor onto scratched areas on metal surfaces, providing 99.4% inhibition efficiency under acidic conditions. Moreover, only limited inhibitor of BTA molecules was leached out (less than 4%) in a neutral environment. Furthermore, the ZIF-7@BTA nanoparticles were further distributed in the polymer matrix to prepare the self-healing anticorrosion coatings for corrosion resistance enhancement in an acidic environment. Electrochemical impedance spectroscopy (EIS) analysis was utilized to characterize the corrosion resistance.