Micelles-based self-healing coating for improved protection of metal

• Published in: Arabian journal of chemistry Vol. 13; no. 1; pp. 3137 - 3148
• Main Authors: Ying, Ye, Liu, Zequn, Fan, Juanjuan, Wei, Nan, Guo, Xiaoyu, Wu, Yiping, Wen, Ying, Yang, Haifeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2020; Elsevier
• Subjects: 4-Methyl-4H-1,2,4-triazole-3-thiol (4-MTTL); Copper; Corrosion inhibitor; Phytic acid micelles; Self-healing; Self-healing; Copper; 4-Methyl-4H-1,2,4-triazole-3-thiol (4-MTTL); Corrosion inhibitor; Phytic acid micelles
• ISSN: 1878-5352; 1878-5379
• DOI: 10.1016/j.arabjc.2018.09.005

In this work, an eco-friendly corrosion inhibitor was synthesized by embedding 4-methyl-4H-1,2,4-triazole-3-thiol (4-MTTL) into phytic acid (IP6) micelles via heating (donated as IP6@4-MTTLx). The corrosion inhibitor, IP6@4-MTTLx microcapsules with self-healing capability, can be used for metal protection from corrosion in 3.5 wt% NaCl aqueous solution. By means of electrochemical impedance spectroscopy (EIS) and electrochemical polarization, the high inhibition performance of such micelle-based coating on the model metal of copper has been investigated, which is attributed to the synergistic effect of the 4-MTTL molecules and the IP6@4-MTTLx microcapsules. Damage to the coating by external force can be self-healed by leakage of 4-MTTL inside IP6@4-MTTLx microcapsules to seal physically and chemically the cracks.