期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 41, 页码 47188-47197出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c16151
关键词
nanocontainers; ZnO quantum dots; self-healing; corrosion; inhibitor
资金
- National Natural Science Foundation of China [50801035, 11972178, 51872131, 51972156]
- Joint Fund projects of University of Science and Technology Liaoning State-Key Laboratory of Metal Material for Marine Equipment and Application [HGSKL-USTLN(2020)08]
- Talent Project of Revitalizing LiaoNing [XL YC1807114]
- Technology Liaoning Project Grants [2019LNZD01, 2020LNQN17, 2019QN07]
As an intelligent response system, self-healing anticorrosion materials containing nanocontainers have the potential to efficiently release corrosion inhibitors while avoiding leakage. This study successfully prepared self-healing anticorrosion coatings by sealing benzotriazole (BTA) inhibitors in nanocontainers, and showed the important role of zinc oxide quantum dots (ZnO-QDs) in preventing corrosion.
As an intelligent response system, self-healing anticorrosion materials containing nanocontainers have aroused increasing demands. It is highly expected that the nanocontainers can rapidly respond on corrosion signals to efficiently release corrosion inhibitors, meanwhile to avoid an undesirable leakage before the local corrosion happening. Herein, zinc oxide quantum dot (ZnO-QD)-sealed hollow mesoporous TiO2 nanocontainers loading with 14.2% benzotriazole (BTA) inhibitor have been successfully prepared [hollow mesoporous titanium dioxide nanospheres (HMTNs)-BTA@ZnO-QDs]. ZnO-QDs play the multifunctional roles on anticorrosion of the self-healing coating. The corrosion tests of coatings on the carbon steel well demonstrate that ZnOQDs can not only act as a valve to seal and release BTA on the time but also act as a precursor to produce the protective film of Zn(OH)2 by the reaction of Zn2+ ions with OH- around the cathode region to inhibit the corrosion of carbon steel. After being soaked in 3.5% NaCl solution for 30 days, the |Z|0.01 Hz value of the coating with HMTNs-BTA@ZnO-QDs still maintains at 2.87 x 107 omega cm2. Once the defects are formed in the coating, the acid-responsive ZnO-QD valves are rapidly decomposed to release BTA inhibitor; meanwhile, the resulted Zn(OH)2 layer prevent the carbon steel substrate from corrosion in the cathode area. Therefore, it could be promising that the present design of the nanocontainers matching with the multifunctional ZnO-QDs can offer a valuable strategy to construct the self-healing and anticorrosion coatings with a multiresponse to the corrosion environment.
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