ABSTRACT

Magnesium (Mg) alloys attract a lot of attention owing to their superior properties, while the poor corrosion resistance significantly restricts their extensive applications in practice. The development of a superhydrophobic coating can effectively decrease the contact area between corrosive solutions and the Mg substrate, consequently providing corrosion protection. Herein, a facile approach was proposed, with low cost and no damage to the environment. A nanocomposite coating composed of polyvinylidene fluoride and chemically modified SiO₂ nanoparticles was successfully constructed on the Mg alloy by a spraying method. The nanocomposite coating presented irregular structures with accumulated SiO₂ nanoparticles, entrapped a lot of air pockets. The water contact angle was up to 151.8°. The corrosion current density was reduced by one order of magnitude compared to that of the bare substrate. Therefore, the nanocomposite coating can provide good corrosion protection for the Mg substrate, accelerating the extensive applications of Mg alloys.

摘要

镁（Mg）合金由于其优越的性能而备受关注，但其较差的耐腐蚀性显着限制了其在实践中的广泛应用。超疏水涂层的发展可以有效地减少腐蚀溶液与镁基体之间的接触面积，从而提供腐蚀保护。在此，提出了一种简便的方法，成本低且不破坏环境。通过喷涂方法在镁合金上成功构建了由聚偏氟乙烯和化学改性的SiO ₂纳米粒子组成的纳米复合涂层。纳米复合涂层呈现不规则结构，SiO ₂堆积纳米粒子，夹带了很多气穴。水接触角高达151.8°。与裸基板相比，腐蚀电流密度降低了一个数量级。因此，纳米复合涂层可以为镁基体提供良好的腐蚀保护，加速镁合金的广泛应用。