Stimulus Responsive Zeolitic Imidazolate Framework to Achieve Corrosion Sensing and Active Protecting in Polymeric Coatings
Stimulus Responsive Zeolitic Imidazolate Framework to Achieve Corrosion Sensing and Active Protecting in Polymeric Coatings
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刺激响应沸石咪唑酯框架可实现聚合物涂层的腐蚀传感和主动保护
DOI：
10.1021/acsami.0c22642
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发表时间：
2021
影响因子：
9.5
通讯作者：
Song Zuwei
中科院分区：
文献类型：
--
作者：
Liu Chengbao;Qian Bei;Hou Peimin;Song Zuwei
聚合物涂层下的金属基材易受局部腐蚀影响，如果不及时进行修复处理，可能导致寿命缩短和灾难性故障。腐蚀和修复涂层缺陷的原位检测的需求很高，但迄今为止仍具有挑战性。在此，我们报告了一种智能聚合物涂层集成纳米传感器到涂层基体，这是能够有效的腐蚀传感和主动防腐保护。以聚乙二醇-单宁酸复合物包裹咪唑骨架分子，构建了纳米传感器。系统地分析了纳米传感器的形貌、化学组成和刺激响应性。涂层下局部腐蚀的产生可以通过来自单宁-铁离子坐标的明显的紫色来迅速地感测和报告。局部电化学阻抗谱结果表明，缺陷界面处的金属降解过程得到了很大程度的抑制，表现出积极的抗腐蚀性能。该智能涂层在模拟海水和盐雾条件下具有上级抗渗性和长期防护性能。这种基于简单纳米传感器的智能涂料设计方法为开发具有保护、腐蚀传感和自修复功能的高环境适应性防护材料开辟了一条新的途径。
Metal substrates beneath polymeric coatings are susceptible to localized corrosion, which could result in lifetime reduction and catastrophic failure without timely repair treatment. In situ detection of corrosion and repair coating defects are in high demand yet challenging to fulfill so far. Herein, we report a smart polymeric coating by integrating nanosensors into the coating matrix, which is capable of efficient corrosion sensing and active anticorrosion protecting. The nanosensors were constructed by zeolitic imidazolate framework encapsulated with the polyethylene glycol-tannic acid complex. The morphology, chemical constitution, and stimulus responsiveness of nanosensors were systematically analyzed. The generation of local corrosion beneath coating can be promptly sensed and reported by a conspicuous purple color derived from tannic-iron ion coordinates. Meanwhile, local electrochemical impedance spectroscopy results proved that the metal degradation process at the defected interface can be largely inhibited, exhibiting active anticorrosion property. Furthermore, the constructed smart coating possessed superior impermeability and long-term protective performance under simulated seawater and harsh salts spray conditions. This feasible and effective strategy based on simple nanosensors to engineer smart coatings paves a new way to develop high environmental adaptability protective materials with protecting, corrosion sensing, and self-healing functions.