期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 642, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.128641
关键词
Graphene; ZIF-8; Solid corrosion inhibitor; PH-responsive; Self-healing
资金
- National Natural Science Foundation of China [51974270]
- China Postdoctoral Science Foundation [2020M683362]
- Sichuan Science and Technology Pro-gram [2021YJ0534]
This study combines the properties of graphene and zeolite imidazole framework-8 (ZIF-8) to create a self-healing nanomaterial with excellent barrier properties and high loading rate. ZIF-8 demonstrates outstanding pH-responsive activities and high loading capacity, showing potential as a corrosion inhibitor. Salt spray test and electrochemical impedance spectroscopy results reveal that the RGO@ZIF@SiO2/EP (0.7%) sample exhibits the best corrosion protection performance.
Utilization of self-healing coating is an efficient strategy for protecting metals from corrosion. However, rational design and synthesis of self-healing nanomaterial with excellent barrier property and high loading rate of corrosion inhibitor is still a challenge. Herein, the obvious physical barrier properties of graphene and the self healing function of zeolite imidazole framework-8 (ZIF-8) was combined (RGO@ZIF) based on the concept of composite coating with passive barrier body and active self-healing guest. Herein, as a coordination complex, ZIF-8 can store and release inhibitors (2-methylimidazole) through the formation and cleavage of coordination bonds. Moreover, silica was supported on the ZIF surface (RGO@ZIF@SiO2) to compensate for the negative impact of the remaining voids after ZIF decomposition on the barrier properties of the coatings. The UV-vis results proved that ZIF-8 displayed outstanding pH-responsive activities under acidic conditions, and the loading capacity was up to 63.0%. Therefore, ZIF-8 was proposed as a solid corrosion inhibitor, which is expected to provide a new way to improve the loading rate of inhibitors. The EIS results showed that the impedance values of ZIF/EP, RGO@ZIF/EP and RGO@ZIF@SiO2/EP composites coatings increased inversely with the prolongation of immersion time, attributing to their self-healing performance. Besides, the epoxy loaded 0.7% of RGO@ZIF@SiO2 exhibited the higher impedance value than that of other samples in the whole immersion stage, which can be ascribed to the excellent barrier properties. Moreover, the corrosion products and bubbles on the surface of RGO@ZIF@SiO2/EP (0.7%) sample were the least after 200 h of exposure in salt spray test, further proving its best corrosion protection performance.
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