Abstract

The anti-corrosion effect of the protective coating has an important impact on the service life of metal steel components. In order to meet the high durability requirements of the coating to the new situation, the nanocomposite coating was developed. Nanoparticles and surfactants with multiple components (e.g. C₁₉H₃₉NO₂ and C₁₈H₂₉NaO₃S) were added to the organic solvent (epoxy) though the precise design of the interface structure and the particle size ratio to realize the self-repair function of nanocomposite coating. Nanoparticles form encapsulation structure under the action of surfactants, it can be uniformly dispersed into the matrix and form a matrix grid distribution. On this basis, nanoparticles form self-healing functional groups with chiral reversible double bonds. The double bond can be opened quickly to realize bridged when there is a small crack in the coating, so as to repair the microcrack. The results of electrochemical test indicated that the anticorrosion effect of the new coating is better than that of the original coating, and it has a certain degree of self-repair for microcracks. After soaking in 5%NaCl solution for 24 h, the repair effect can reach 70%.

摘要

保护涂层的防腐效果对金属钢构件的使用寿命有重要影响。为适应新形势下对涂层的高耐久性要求，研制了纳米复合涂层。具有多种成分的纳米颗粒和表面活性剂（例如 C ₁₉ H ₃₉ NO ₂和 C ₁₈ H ₂₉ NaO ₃S)通过界面结构和粒径比的精确设计，添加到有机溶剂（环氧树脂）中，实现纳米复合涂层的自修复功能。纳米粒子在表面活性剂的作用下形成包封结构，可以均匀地分散在基体中，形成基体网格分布。在此基础上，纳米粒子形成具有手性可逆双键的自修复官能团。当涂层中出现小裂纹时，双键可以快速打开实现桥接，从而修复微裂纹。电化学测试结果表明，新涂层的防腐效果优于原涂层，对微裂纹具有一定的自我修复能力。在5%NaCl溶液中浸泡24h后，修复效果可达70%。