Hao Zhentao, Chen Si, Chen Zhiwei, Lin Zhifeng, Li Weihua
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Zhuhai 519082, China.
Polymers (Basel). 2022 Apr 30;14(9):1847. doi: 10.3390/polym14091847.
Self-healing coatings formulated by stimuli-responsive container technology are regarded as a prospective strategy for long-term corrosion protection. However, such types of coatings suffer from low coating adaptability and delays in corrosion protection because the occurrence of corrosion is prior to the release of healants from containers. Herein, we took advantage of the easy hydrolysis of MOF-199 for water-induced self-healing properties. Mixed corrosion inhibitors were loaded into MOF-199 and then incorporated into acrylic coating. The water sensitivity of MOF-199 was investigated and EIS tests were used to evaluate the self-healing performance. Due to the collapse of the porous MOF-199 structure, corrosion inhibitors could be released from MOF-199 with the invasion of water into acrylic coating. The corrosion resistance performance of damaged self-healing coating gradually increased. The metal exposed to artificial defects was well protected due to a barrier formed by corrosion inhibitors. Owing to these merits, this self-healing coating is recommended for use in various fields of engineering for corrosion resistance.
由刺激响应容器技术配制的自修复涂层被视为一种长期防腐蚀的前瞻性策略。然而，这类涂层存在涂层适应性低和防腐蚀延迟的问题，因为腐蚀的发生先于愈合剂从容器中释放。在此，我们利用MOF-199易于水解的特性实现水致自修复性能。将混合缓蚀剂负载到MOF-199中，然后掺入丙烯酸涂层。研究了MOF-199的水敏感性，并通过电化学阻抗谱（EIS）测试来评估自修复性能。由于多孔MOF-199结构的坍塌，随着水侵入丙烯酸涂层，缓蚀剂可从MOF-199中释放出来。受损自修复涂层的耐腐蚀性能逐渐提高。由于缓蚀剂形成的屏障，暴露于人工缺陷处的金属得到了很好的保护。鉴于这些优点，这种自修复涂层推荐用于各种工程领域的耐腐蚀应用。
