Tian Zhaowen, Li Suning, Chen Yiqing, Li Lixiang, An Zhizheng, Zhang Yanqiu, Tong Anqi, Zhang Han, Liu Zunfeng, An Baigang
Key Laboratory of Energy Materials and Electrochemistry Liaoning Province, School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China.
ACS Appl Mater Interfaces. 2022 Oct 19;14(41):47188-47197. doi: 10.1021/acsami.2c16151. Epub 2022 Oct 10.
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 TiO 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 ZnO-QDs 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) by the reaction of Zn 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 || value of the coating with HMTNs-BTA@ZnO-QDs still maintains at 2.87 × 10 Ω cm. 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) 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.
作为一种智能响应系统，含有纳米容器的自修复防腐材料的需求日益增加。人们高度期望纳米容器能够对腐蚀信号迅速做出反应，以有效释放缓蚀剂，同时避免在局部腐蚀发生之前出现不必要的泄漏。在此，成功制备了负载14.2%苯并三唑（BTA）缓蚀剂的氧化锌量子点（ZnO-QD）密封的中空介孔TiO纳米容器[中空介孔二氧化钛纳米球（HMTNs）-BTA@ZnO-QDs]。ZnO-QDs在自修复涂层的防腐中发挥着多功能作用。碳钢上涂层的腐蚀试验充分表明，ZnO-QDs不仅可以作为阀门，适时密封和释放BTA，还可以作为前驱体，通过锌离子与阴极区域周围的OH反应生成Zn(OH)保护膜，从而抑制碳钢的腐蚀。在3.5% NaCl溶液中浸泡30天后，含有HMTNs-BTA@ZnO-QDs的涂层的||值仍保持在2.87×10Ω·cm。一旦涂层中形成缺陷，酸响应性的ZnO-QD阀门会迅速分解以释放BTA缓蚀剂；同时，生成的Zn(OH)层可防止碳钢基体在阴极区域发生腐蚀。因此，目前这种与多功能ZnO-QDs相匹配的纳米容器设计有望为构建对腐蚀环境具有多重响应的自修复防腐涂层提供一种有价值的策略。
