Preparation of alkaline-responsive nano-electrospinning and anticorrosion properties of self-healing coating

碱性响应型纳米静电纺丝的制备及自修复涂层的防腐性能研究

In this paper,1-butyl-3-methylimidazole tetrafluoroborate([BMIM]BF4)is used as corrosion inhibitor.Polyacrylonitrile(PAN)is used to load the corrosion inhibitor.PAN/[BMIM]BF4 hybrid nanofibers are successfullysynthesized by electrospinning technology.The alkyd varnish is coated on the fiber membrane to prepare a compositecoating,and then a series of tests are carried out on the self-healing and anticorrosive performance of the compositecoating.It is observed by scanning electron microscope that the fiber morphology is stable and there is no bead-likestructure.The composition of the composite fiber is analyzed by Fourier infrared spectroscopy,and it is confirmed thatthe hybrid nanofiber was successfully prepared.3D laser confocal scanning microscope was used to observe thecorrosion morphology and profile of the carbon steel.The composite coating shows good self-healing performance.[BMIM]BF4 can form a protective film on the surface of the bare carbon steel substrate through physical adsorption orchemical adsorption in an alkaline environment.Electrochemical impedance spectroscopy was tested and analyzed.It isfound that the maximum corrosion inhibition efficiency of the coating is 88.5%in 3.5 wt.%alkaline NaCl solution.Compared with the blank coating without nanofibers,the composite fiber varnish composite coating exhibits good selfhealingand anti-corrosion properties.

本文以聚丙烯腈(PAN)负载缓蚀剂1-丁基-3-甲基咪唑四氟硼酸盐([BMIM)]BF_(4)),利用静电纺丝技术合成PAN/[BMIM]BF_(4)纳米纤维。将醇酸清漆涂覆在纤维膜上制备复合涂层,并对复合涂层的自愈性能和防腐性能进行研究。通过扫描电镜观察到纤维形态稳定,不存在珠状结构。利用傅里叶红外光谱分析了复合纤维的组成,证实了复合纳米纤维的成功制备。利用三维激光共聚焦扫描显微镜观察碳钢的腐蚀形态和腐蚀剖面,复合涂层具有良好的自修复性能。[BMIM]BF_(4)可在碱性环境下通过物理吸附或化学吸附在裸碳钢基材表面形成保护膜。利用电化学阻抗谱分析和测试得知,在3.5 wt.%的碱性NaCl溶液中,涂层的最大缓蚀效率为88.5%。与不含纳米纤维的涂层相比,复合纤维清漆复合涂层具有良好的自修复和抗腐蚀性能。