Self-healing coatings for long-term corrosion protection have received much interest in recent years. However, most self-healing coatings rely on healants released from microcapsules, dynamic bonds, shape memory, or thermoplastic materials, which generally suffer from limited healing times or harsh conditions for self-healing, such as high temperature and UV radiation. Herein, we present a composite coating with a self-healing function under easily accessible sunlight by adding Fe₃O₄ nanoparticles and tetradecanol into epoxy resin. Tetradecanol, with its moderate melting point, and Fe₃O₄ nanoparticles serve as a phase-change component and photo-thermal material in an epoxy coating system, respectively. Fe₃O₄ nanoparticles endow this composite self-healing coating with good photothermal properties and a rapid thermal response time under simulated solar irradiation as well as outdoor real sunlight. Tetradecanol can flow to and fill defects by phase transition at low temperatures. Therefore, artificial defects created in this type of self-healing coating can be healed by the liquified tetradecanol induced by the photothermal effect of Fe₃O₄ nanoparticles under simulated solar irradiation. The healed coating can still serve as a good barrier for the protection of the underlying carbon steel. These excellent properties make this self-healing coating an excellent candidate for various engineering applications.

近年来，用于长期腐蚀保护的自修复涂层受到了极大的关注。然而，大多数自修复涂层依赖于从微胶囊、动态键、形状记忆或热塑性材料中释放出来的修复剂，这些材料通常会受到有限的修复时间或自修复的苛刻条件（例如高温和紫外线辐射）的影响。_{在此，我们通过将 Fe 3} O ₄纳米颗粒和十四烷醇添加到环氧树脂中，提出了一种在容易获得的阳光下具有自修复功能的复合涂层。具有中等熔点的十四烷醇和 Fe ₃ O ₄纳米颗粒分别用作环氧树脂涂层系统中的相变组分和光热材料。Fe ₃ O₄纳米粒子赋予这种复合自修复涂层良好的光热性能和在模拟太阳辐射以及室外真实阳光下的快速热响应时间。十四烷醇可以在低温下通过相变流入并填充缺陷。因此，这种自修复涂层中产生的人工缺陷可以通过模拟太阳辐射下Fe ₃ O ₄纳米粒子的光热效应诱导的液态十四烷醇进行修复。愈合后的涂层仍然可以作为保护底层碳钢的良好屏障。这些优异的性能使这种自修复涂层成为各种工程应用的绝佳候选者。