Wang Ruzheng, Cao Lin, Wang Wei, Mao Zhipeng, Han Dongxiao, Pei Yantong, Chen Ye, Fan Weijie, Li Wen, Chen Shougang
School of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, China.
Beijing Shiny Tech. Co. Ltd, No.50 Yongding Road, Beijing, 100039, China.
ACS Appl Mater Interfaces. 2024 Aug 14;16(32):42748-42761. doi: 10.1021/acsami.4c09260. Epub 2024 Jul 31.
With increasingly severe metal corrosion, coating preparation with high-performance corrosion protection has attracted more attention. Herein, the encapsulation of the corrosion inhibitor 8-hydroxyquinoline (8-HQ) as well as the self-healing agent linseed oil (LO) in polyvinyl alcohol (PVA) and chitosan (CS) shells were realized by coaxial electrospinning, which was recorded as PVA/CS@LO/8-HQ core-shell nanofibers. PVA/CS@LO/8-HQ nanofibers were employed to promote the high-performance corrosion protection of the epoxy coating. The anticorrosion mechanism was that the change of the local pH on the metal surface stimulated the release of 8-HQ from the nanofibers, which were then chelated with iron ions to form a complex. When cracks occurred and caused rupture of the nanofibers, LO was released and reacted with oxygen to cure them so that the cracks could be healed autonomously. The dynamic potential polarization curves showed that the corrosion inhibition efficiency of the compound inhibitor LO + 8-HQ reached 87.54%, 90.31%, and 85.57% at pH = 3, 7, and 11, respectively, higher than that of the single corrosion inhibitor. Density functional theory calculations revealed that the LO and 8-HQ combination, forming a hydrogen bond interaction, promoted the adsorption of inhibitors on the steel surface. Scanning Kelvin probe and electrochemical impedance spectroscopy proved the self-healing corrosion protection properties of the epoxy coating. These results demonstrated that embedding PVA/CS@LO/8-HQ nanofibers in the coating could obtain self-healing properties, and promote the mechanical and corrosion protection of epoxy coating.
随着金属腐蚀日益严重，制备具有高性能防腐蚀性能的涂层受到了更多关注。在此，通过同轴静电纺丝实现了将缓蚀剂8-羟基喹啉（8-HQ）以及自修复剂亚麻籽油（LO）包裹在聚乙烯醇（PVA）和壳聚糖（CS）壳中，记录为PVA/CS@LO/8-HQ核壳纳米纤维。PVA/CS@LO/8-HQ纳米纤维被用于促进环氧涂层的高性能防腐蚀。其防腐机理是金属表面局部pH值的变化刺激纳米纤维释放8-HQ，然后8-HQ与铁离子螯合形成络合物。当出现裂纹并导致纳米纤维破裂时，LO释放并与氧气反应使其固化，从而使裂纹能够自动愈合。动电位极化曲线表明，复合缓蚀剂LO + 8-HQ在pH = 3、7和11时的缓蚀效率分别达到87.54%、90.31%和85.57%，高于单一缓蚀剂。密度泛函理论计算表明，LO和8-HQ组合形成氢键相互作用，促进了缓蚀剂在钢表面的吸附。扫描开尔文探针和电化学阻抗谱证明了环氧涂层的自修复防腐蚀性能。这些结果表明，在涂层中嵌入PVA/CS@LO/8-HQ纳米纤维可以获得自修复性能，并提高环氧涂层的机械性能和防腐蚀性能。
