Amino-functionalized Ti3C2Tx loading ZIF-8 nanocontainer@benzotriazole as multifunctional composite filler towards self-healing epoxy coating

Han Yan; Xiaoqiang Fan; Meng Cai; Shijie Song; Minhao Zhu

doi:10.1016/j.jcis.2021.06.004

Amino-functionalized Ti₃C₂T_x loading ZIF-8 nanocontainer@benzotriazole as multifunctional composite filler towards self-healing epoxy coating

J Colloid Interface Sci. 2021 Nov 15:602:131-145. doi: 10.1016/j.jcis.2021.06.004. Epub 2021 Jun 4.

Authors

Han Yan¹, Xiaoqiang Fan², Meng Cai³, Shijie Song¹, Minhao Zhu⁴

Affiliations

¹ Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031 China.
² Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031 China. Electronic address: fxq@home.swjtu.edu.cn.
³ Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031 China.
⁴ Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031 China; Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031 China.

PMID: 34119753
DOI: 10.1016/j.jcis.2021.06.004

Abstract

It is difficult for Ti₃C₂T_x-containing epoxy coatings to prevent electrochemical corrosion at the metal/coating interface after long-term exposure to corrosive environments. Thus, endowing Ti₃C₂T_x-containing epoxy coatings with self-healing function and good wear resistance is very significant. Here, a novel self-healing epoxy coating (f-Ti₃C₂T_x-ZB@EP) is designed via incorporating with amino-functionalized Ti₃C₂T_x loading 2-methylimidazole zinc salt (ZIF-8) nanocontainer@benzotriazole (f-Ti₃C₂T_x-ZB) multifunctional composite filler, and its anti-corrosion and tribological properties are evaluated in detail. The as-prepared f-Ti₃C₂T_x-ZB@EP shows an order of magnitude enhancement in coating resistance (R_c) and achieves self-healing function under severe environment, which are attributed to the synergistic effect of passive and active protection. Specially, the change of pH value caused by electrochemical corrosion could induce the nanocontainer to release BTA, thereby forming corrosion inhibition films on the coating/metal interface. Besides, the wear rate of f-Ti₃C₂T_x-ZB@EP is decreased by one order of magnitude because of the lubrication effect of Ti₃C₂T_x at the friction interface and the high resistance to plastic deformation of epoxy composite coating. Therefore, f-Ti₃C₂T_x-ZB@EP with better self-healing, anti-corrosion and tribological properties is equipped with long-term metal protection ability and enlightens a thought-provoking idea for corrosion and wear resistance.

Keywords: Corrosion; Nanocontainer; Self-healing; Ti(3)C(2)T(x) MXene; Wear.