Photothermal and pH dual-responsive self-healing coating for smart corrosion protection  

作　　者：Yao Huang Panjun Wang Weimin Tan Wenkui Hao Lingwei Ma Jinke Wang Tong Liu Fan Zhang Chenhao Ren Wei Liu Dawei Zhang 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]National Materials Corrosion and Protection Data Center,University of Science and Technology Beijing,Beijing 100083,China [3]National Engineering Research Center for Coatings,CNOOC Changzhou Paint and Coatings Industry Research Institute,Changzhou 213016,China [4]State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co.Ltd.,),Beijing 100083,China [5]BRI Southeast Asia Network for Corrosion and Protection(MOE),Shunde Graduate School of University of Science and Technology Beijing,Foshan 528300,China

出　　处：《Journal of Materials Science & Technology》2022年第12期34-42,共9页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51771029 and 51901015)。

摘　　要：A novel self-healing coating with photothermal and pH dual-responsive properties has been designed to protect carbon steel against corrosion by loading the stimuli-responsive microcapsules into a shape memory epoxy coating. The sandwich-like microcapsules were based on reduced graphene oxide/mesoporous silica(r GO@MS) assembled with a p H-responsive poly(N,N-dimethylaminoethyl methacrylate)(PDMAEMA) layer, and were loaded with benzotriazole(BTA) inhibitors(abbreviated as rGO@MS-P-BTA). Under near-infrared(NIR) light irradiation, the prominent photothermal effect of rGO could not only elevate the coating temperature to activate the shape memory effect and close the coating scratch, but also facilitate the release of corrosion inhibitors to suppress the corrosion activity. Moreover,the PDMAEMA as a p H-driven “gatekeeper” realized the controlled release of BTA from microcapsules at acid conditions. The surface morphology analysis, electrochemical impedance spectroscopy(EIS), and scanning electrochemical microscopy(SECM) were performed to evaluate the self-healing performance of the composite coatings. The results showed that the combination of NIR light and p H-responsive selfhealing effects endowed the coating with short healing time and prominent healing efficiency.

关 键 词：Self-healing coatings Corrosion inhibitors Photothermal effects PH-RESPONSIVE Shape memory polymers 

分 类 号：TG174.4[金属学及工艺—金属表面处理]