In this study, the self-healing behavior of the polyurethane coating containing polyurethane microcapsules was investigated. Microcapsules, with the average size of 99 µm and shell thickness of 11 µm, were successfully synthesized via the interfacial polymerization technique and were incorporated into the polyurethane coating matrix. The electrochemical impedance spectroscopy and scanning electron microscope were employed to investigate the healing performance and corrosion behavior of the coatings on the carbon steel substrate. The recorded results revealed that artificial scratches were successfully healed and the coating containing 20 wt% microcapsules exhibited the best healing performance (85% healing efficiency) among all the prepared coatings. The self-healing ability of the coatings was verified via scanning electron microscope. After 24 h, the healing efficiency attained a reasonable value of 68% during exposure to test solution. It was found that corrosion resistance and coating adhesion were significantly improved by incorporating the microcapsules into the coating.

在这项研究中，研究了含有聚氨酯微胶囊的聚氨酯涂层的自修复行为。通过界面聚合技术成功合成了平均尺寸为 99 µm 和壳厚度为 11 µm 的微胶囊，并将其掺入聚氨酯涂层基质中。采用电化学阻抗谱和扫描电子显微镜研究了碳钢基体上涂层的愈合性能和腐蚀行为。记录的结果表明，人工划痕被成功愈合，含有 20 wt% 微胶囊的涂层在所有制备的涂层中表现出最佳的愈合性能（85% 的愈合效率）。通过扫描电子显微镜验证了涂层的自修复能力。24 小时后，在暴露于测试溶液期间，愈合效率达到了 68% 的合理值。发现通过将微胶囊掺入涂层中，耐腐蚀性和涂层附着力显着提高。