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

Abstract

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 successfully synthesized by electrospinning technology. The alkyd varnish is coated on the fiber membrane to prepare a composite coating, and then a series of tests are carried out on the self-healing and anticorrosive performance of the composite coating. It is observed by scanning electron microscope that the fiber morphology is stable and there is no bead-like structure. The composition of the composite fiber is analyzed by Fourier infrared spectroscopy, and it is confirmed that the hybrid nanofiber was successfully prepared. 3D laser confocal scanning microscope was used to observe the corrosion 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 or chemical adsorption in an alkaline environment. Electrochemical impedance spectroscopy was tested and analyzed. It is found 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 self-healing and anti-corrosion properties.

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Central South University