Two-dimensional (2D) nanocomposite coatings and superhydrophobic coatings are applied to retarding corrosion of Magnesium (Mg) and its alloys. However, stability of the delicate micro/nanostructure and corrosion durability are still intractable issues. In this work, a bi-layer superhydrophobic coating with excellent corrosion resistance has been successfully constructed on Mg alloy via a facile spray/spin assisted self-assembly technique. The polyurethane (PU) coating containing well-dispersed hydroxylated hexagonal boron nitride (OH-BN) nanoparticles acts as the barrier layer and “adhesive”, while the superhydrophobic modified h-BN (f-BN) nanoparticles serve as the water-repellent surface. In addition, the modifying agents containing dynamic disulfide bonds provide covalent bonding effect to construct a stable superhydrophobic surface. Hence, the obtained coating presents extreme non-wettability with an impressive static water contact angle (WCA) of 155° as well as possesses outstanding anti-water adhesion, anti-fouling and self-cleaning performance. Meanwhile, the designed coating shows excellent corrosion durability, which the value of |Z|f = 0.01 Hz retains at 9.5 × 109 Ω cm2, higher than PU coating of two orders of magnitude. The developed coating shows promising potentials as a durable protective material for Mg alloy and other metals and alloys, shedding new lights on developing high-performance corrosion resistance technologies.

中文翻译：

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由功能化的六方氮化硼和基于 PDMS 的镁合金聚氨酯实现长期防腐蚀的双层超疏水涂层


二维 （2D） 纳米复合涂层和超疏水涂层应用于延缓镁 （Mg） 及其合金的腐蚀。然而，精细的微纳米结构的稳定性和耐腐蚀性仍然是棘手的问题。在本工作中，通过简单的喷涂/旋转辅助自组装技术，成功地在 Mg 合金上构建了具有优异耐腐蚀性的双层超疏水涂层。含有分散良好的羟基化六方氮化硼 （OH-BN） 纳米颗粒的聚氨酯 （PU） 涂层充当阻挡层和“粘合剂”，而超疏水改性 h-BN （f-BN） 纳米颗粒用作防水表面。此外，含有动态二硫键的改性剂提供共价键合作用，以构建稳定的超疏水表面。因此，所获得的涂层具有极强的不润湿性，具有令人印象深刻的 155° 静态水接触角 （WCA），并具有出色的抗水粘附、防污和自清洁性能。同时，设计的涂层显示出优异的耐腐蚀性，其价值 |Z|f = 0.01 Hz 保持在 9.5 × 109 Ω cm2，比 PU 涂层高两个数量级。开发的涂层显示出作为 Mg 合金和其他金属和合金的耐用保护材料的潜力，为开发高性能耐腐蚀技术提供了新的前景。