Fabrication Of Coatings With Electrospun Nanofibers And Evaluation Of Anticorrosion

Self-healing ability has become a hot topic in the field of anti-corrosion coatings.The use of hollow fiber technology is also one of the important technologies for self-healing coating systems.We reported that the polyacrylonitrile nanofibers(PAN-NFs)filling with benzotriazole(BTA)via electrospinning technique were directly deposed on metal surface and then composed with epoxy coating.The composite coating was applied onto Q235 carbon steel to improve its anticorrosion ability.The optional experiments conditions were obtained by means of orthogonal experiments.The nanofibers prepared under different parameters were studied,and the influence of different parameters on the morphology and properties of polyacrylonitrile nanofibers was mastered to determine the optimal spinning parameters.The mechanical properties of the composite coatings were studied by tensile test.The self-repairing mechanism of the composite coatings coated with corrosion inhibitors was studied by electrochemical impedance spectroscopy.The corrosion resistance of the composite coatings was studied by salt spray test.The results showed that the optimal preparation parameters of polyacrylonitrile fiber in electrospinning process were: polymer spinning solution concentration was 6%(wt.),spinning voltage was 20 k V,and spinning push rate was shell solution(polyacrylonitrile solution)was 0.65 mm/min,the core solution(corrosion inhibitor solution)was 0.06 mm/min,and the spinning receiving distance was 15 cm.The morphology and core-shell structure of the fibers were characterized by electron microscopy(SEM,TEM).Infrared Raman technique confirmed that the corrosion inhibitor was successfully coated in the fiber and the coverage was calculated to be 5%.The mechanical properties of the epoxy coating after embedding the fiber were significantly improved and the strength of the epoxy coating was also enhanced.Electrochemical test results showed that the nanofiber loaded with corrosion inhibitor has excellent anti-corrosion performance after being embedded in resin coating and had certain self-healing ability.Polyacrylonitrile nanofiber provides reliable long-term storage space for corrosion inhibitor and prevents it.Premature failure occurs,the protection of the metal matrix is more comprehensive,and the protection time is more durable.Therefore,the corrosion inhibitor was loaded with the polyacrylonitrile nanofiber by electrospinning technology,and then coated with an epoxy resin coating,so that the coating had self-healing properties.The invention solves the defects that the corrosion inhibitor easy to fail,and effectively blocks the direct contact between the metal substrate and the corrosive ions,thereby enhancing the anticorrosion performance of the coating on the metal substrate.The mechanical properties of the resin coating were enhanced and the toughness was enhanced without changing the advantages of the epoxy resin itself,so that the composite coating performance is more excellent.Therefore,it plays an important role in the anti-corrosion and toughening of the coating.