目的 研究由负载缓蚀剂的多孔SiO2微球(SiO2)和7537聚氨酯所制备的自修复涂层的耐蚀性能和防腐机理。方法 利用负压-浸渍法将苯并三氮唑(BTA)负载到SiO2微球中；利用X射线衍射(XRD)、扫描电子显微镜(SEM)、热重分析(TGA)分别对SiO2的形貌与BTA负载含量进行分析检测；利用划痕浸泡试验、电化学极化曲线及交流阻抗技术研究SiO2、BTA以及负载有BTA的多孔SiO2微球(SiO2/BTA)对涂层耐蚀性能的影响。结果 SEM图像分析表明SiO2微球粒径约为1 μm；热重分析试验表明BTA的负载含量为32.38 wt%。划痕试验表明在浸泡的过程中除了PU+SiO2/BTA coating试样外其他试样的划痕处都出现宏观腐蚀现象；电化学极化曲线和交流阻抗结果表明PU+SiO2/BTA coating试样始终具有最低的电流密度和较高的阻抗值。结论 涂层中的多孔SiO2一方面可以储存BTA,当该涂层产生缺陷时,SiO2中的BTA被释放出来并在基体的缺陷处吸附成膜,从而使该涂层对微观缺陷具有一定的自修复功能；另一方面提高了涂层的致密性,两方面的协同作用使PU+SiO2/BTA coating试样具有最好的耐蚀性能和一定的自修复功能。

In order to study the corrosion resistance and anti-corrosion mechanism of the self-healing coating which was prepared by adding corrosion inhibitors loaded mesoporous SiO2 microspheres into 7537 polyurethane. Method The benzotriazole (BTA) was loaded into SiO2 microspheres by negative pressure-impregnation method. The morphology and crystal structure of SiO2 microspheres and loading content of BTA were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The effect of SiO2, BTA, SiO2-BTA addition on corrosion resistance of the coatings were studied by potentiodynamic polarization curve measurement and electrochemical impedance spectroscopy (EIS). Results SEM images showed the size of SiO2 is approximately 1 μm. TGA showed the loading content of BTA is 32.38 wt%. According to immersion test, corrosion appeared on all kinds of coatings in the progress of immersion apart from the PU SiO2/BTA coating samples. The electrochemical polarization curve and EIS results showed that PU+SiO2/BTA coating samples always has the lowest current density and higher impedance values.