通过仿生设计构建具有微脉管网结构的自愈合环氧树脂涂层以应对金属腐蚀问题。以二甲基亚砜为介质,采用超声分散技术将木质素(1.5%,wt,质量分数,下同)与桐油(4%)复合于环氧树脂基体,经层层组装在碳钢表面形成防护体系。电化学测试表明:优化涂层在3.5% NaCl溶液中经划痕处理后,腐蚀电流密度较传统涂层降低2个数量级,阻抗模值提升近3倍。微观结构表征证实:超声分散20min可使修复剂形成均匀存储-释放网络,损伤后能有效实现自修复功能。可为开发长效防腐材料提供创新解决方案。
A biomimetic design was employed to construct self-healing epoxy coatings with a microvascular network structure to address metal corrosion issues.Using dimethyl sulfoxide (DMSO) as the medium,lignin (1.5wt%,mass fraction,same below) and tung oil (4wt%) were integrated into the epoxy resin matrix via ultrasonic dispersion,followed by layer-by-layer assembly on carbon steel surfaces to form a protective system.Electrochemical tests revealed that the optimized coating in 3.5% NaCl solution exhibited a two-order-of-magnitude reduction in corrosion current density and a threefold increase in impedance modulus after scratch treatment compared to conventional coatings.Microstructural characterization confirmed that ultrasonic dispersion for 20min enabled the healing agents to form a uniform storage-release networks,achieving effective self-healing post-damage.This work provides an innovative solution for developing long-lasting anticorrosion materials.
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基金资助
江苏省产学研合作项目(BY20230521);常州大学高等职业教育研究院资助项目(CDGZ202440);常州市科技计划软科学研究专项(CR20241017)
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