Polydopamine (PDA), which is a mussel-inspired synthetic polymer, is widely used in surface modification field because of the high potential of the dopamine functional groups. Herein, we develop an SnO₂ nanocontainer and deposit polypyrrole (PPy), molybdate corrosion inhibitors and PDA layers using the layer-by-layer self-assembly technology. Then, the SnO₂ nanocontainer were incorporated into the epoxy coating to improve their corrosion resistance and self-healing ability and realize the active corrosion protection of stainless steels. The XRD, FTIR, TGA and Zeta potential results confirm the deposition of each layer on the surface of the SnO₂ nanocontainer. The FESEM and HRTEM images confirm the formation of the core-shell structures on the SnO₂ nanocontainers. The ICP-MS test indicates the slow-release tendency of the encapsulated molybdate corrosion inhibitors the in neutral environments. Further, the corrosion behaviors of the epoxy-based coatings with/without 10 wt. % SnO₂ nanocontainers are evaluated using electrochemical tests in 3.5 wt. % NaCl solution. Results suggest that epoxy coatings with PDA-decorated SnO₂ nanocontainers exhibit a high corrosion resistance and an excellent self-healing performance. The enhanced anti-corrosion and self-healing properties of the epoxy coatings can be attributed to the deposited PDA layer on the SnO₂ nanocontainer, which serves as a pH-sensitive gatekeeper that can control the on-demand release of the molybdate corrosion inhibitor and promote the reformation of the cracked polymer networks using the dopamine functional groups and iron oxide. Furthermore, various -OH groups provided by PDA facilitates the dispersion of the SnO₂ nanocontainers in epoxy coatings. The application of multi-functional dopamine-based gatekeepers will allow more applications with respect to multi-functional intelligent anti-corrosive coating formulations.

聚多巴胺（PDA）是一种贻贝启发性的合成聚合物，由于多巴胺官能团的潜力很大，因此被广泛用于表面改性领域。本文中，我们开发了SnO ₂纳米容器，并使用逐层自组装技术沉积了聚吡咯（PPy），钼酸盐腐蚀抑制剂和PDA层。然后，将SnO ₂纳米容器掺入环氧涂层中，以提高其耐腐蚀性和自愈能力，并实现不锈钢的主动腐蚀防护。XRD，FTIR，TGA和Zeta电位结果证实了每一层在SnO ₂纳米容器表面上的沉积。FESEM和HRTEM图像证实了SnO上核壳结构的形成_2个纳米容器。ICP-MS测试表明在中性环境中，封装的钼酸盐缓蚀剂的缓释趋势。此外，具有/不具有10wt。％的环氧基涂料的腐蚀行为。使用3.5重量％的电化学测试评估％SnO ₂纳米容器。％NaCl溶液。结果表明，具有PDA装饰的SnO ₂纳米容器的环氧涂料具有较高的耐腐蚀性和优异的自修复性能。环氧涂层的增强的抗腐蚀和自修复性能可以归因于SnO ₂上沉积的PDA层纳米容器，用作对pH敏感的网守，可以控制钼酸盐腐蚀抑制剂的按需释放，并使用多巴胺官能团和氧化铁促进裂解的聚合物网络的重整。此外，PDA提供的各种-OH基团促进了SnO ₂纳米容器在环氧涂层中的分散。基于多功能多巴胺的网闸的应用将允许在多功能智能防腐蚀涂料配方方面有更多的应用。