In this work, urea-formaldehyde (UF) microcapsules loaded with tung oil were prepared by in-situ polymerization. The mean diameter of the obtained microcapsules was 8.5 μm. The self-healing coating was prepared by the addition of 5 wt.% microcapsules into an epoxy matrix and then painted on the AA2024 substrate. The effect on the coating properties after the incorporation of microcapsules was investigated by adhesion tests and electrochemical impedance spectroscopy (EIS). It is found that 5 wt.% microcapsules in coating formulations did not impart a significant negative effect on coating properties. SEM and EIS tests were used to evaluate the self-healing effect. According to the fitting results of the EIS data on the scratched samples, the new film that formed by the polymerization of tung oil at the scratched area in the self-healing coating displays a resistance value of more than 10⁶ Ω·cm², which is much higher than 10³ Ω·cm² of the oxide layer in the neat epoxy coating. The neutral salt spray tests also confirm the good anti-corrosion performance of the self-healing coating.

在这项工作中，通过原位聚合制备了装载有桐油的脲醛（UF）微胶囊。所获得的微胶囊的平均直径为8.5μm。通过将5重量％的微胶囊添加到环氧基质中来制备自修复涂层，然后将其涂在AA2024基底上。通过附着力测试和电化学阻抗谱（EIS）研究了微囊掺入后对涂层性能的影响。发现在涂料制剂中5重量％的微胶囊没有对涂料性能产生明显的负面影响。SEM和EIS测试用于评估自我修复效果。根据EIS数据在划痕样本上的拟合结果，⁶ Ω·厘米²，这比10高得多的³ Ω·厘米²在纯环氧树脂涂层的氧化层。中性盐雾测试还证实了自修复涂层的良好防腐性能。