A superhydrophobic, self-healing anti-corrosion coating was prepared by in-situ growth of tungstate corrosion inhibitor intercalated layer double hydroxides (LDHs) conversion film on the AZ31B magnesium alloy and then post-sealing a hydrophobic polymer layer of ureido crosslinked polydimethylsiloxane (U-PDMS) with laurate modified LDHs power (La-LDH) on the surface. The coverage of the dense, water-repellent top layer could suppress the penetration of electrolyte into the bottom LDHs layer and preserve the intercalated tungstate inhibitor from being wasted by ion-exchange at the very beginning of immersion. The anti-corrosion performance provided by the composite film was assessed by multiple methods including, potentiodynamic polarization, open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), immersion test and scanning vibrating electrode technique (SVET). The results indicate that compared to LDHs coating, the superhydrophobic composite coating shows longer term protection and faster self-healing effect, which is of great significance to expand the potential applications of magnesium alloys.

通过在AZ31B镁合金上原位生长钨酸盐腐蚀抑制剂插层双氢氧化物（LDHs）转化膜，然后将脲基交联聚二甲基硅氧烷（U -PDMS）在表面具有月桂酸酯修饰的LDHs功率（La-LDH）。致密的疏水顶层的覆盖可以抑制电解质渗透到底层LDHs层中，并防止嵌入的钨酸盐抑制剂在浸入刚开始时就因离子交换而被浪费。通过多种方法评估了复合膜提供的抗腐蚀性能，包括电位动力学极化，开路电势（OCP），电化学阻抗谱（EIS），浸没测试和扫描振动电极技术（SVET）。结果表明，与LDHs涂层相比，超疏水复合涂层具有长期的保护作用和更快的自愈作用，这对于扩大镁合金的潜在应用具有重要意义。