Zhou Baoming, Wu Yongling, Zheng Hongyu
Centre for Advanced Laser Manufacturing (CALM), School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China.
Materials (Basel). 2023 Feb 8;16(4):1417. doi: 10.3390/ma16041417.
Current methods for the protection of metal surfaces utilize harsh chemical processes, such as organic paint or electro-plating, which are not environment-friendly and require extensive waste treatments. In this study, a two-step approach consisting of electrochemical assisted deposition (EAD) of an aqueous silane solution and a dip coating of a low surface energy silane for obtaining a superhydrophobic self-cleaning surface for the enhanced protection of copper substrate is presented. A porous and hierarchical micro-nanostructured silica basecoat (sol-gel) was first formed by EAD of a methyltriethoxysilane (MTES) precursor solution on a copper substrate. Then, a superhydrophobic top-coat (E-MTES/PFOTS) was prepared with 1H,1H,2H,2H-Perfluorooctyltriethoxysilane (PFOTS) for low surface energy. The superhydrophobic coating exhibited anti-stain properties against milk, cola, and oil, with contact angles of 151°, 151.5°, and 129°, respectively. The EAD deposition potential and duration were effective in controlling the microscopic morphology, surface roughness, and coating thickness. The E-MTES/PFOTS coatings exhibited chemical stability against acids, bases, and abrasion resistance by sandpaper. The proposed 2-layer coating system exhibited strong chemical bonding at the two interfaces and provided a brush-like surface morphology with long-lasting superhydrophobicity. The developed method would provide an environment-friendly and expedient process for uniform protective coatings on complex surfaces.
目前用于保护金属表面的方法采用的是诸如有机涂料或电镀等苛刻的化学工艺，这些工艺不环保且需要大量的废物处理。在本研究中，提出了一种两步法，该方法包括电化学辅助沉积（EAD）水性硅烷溶液以及浸涂低表面能硅烷，以获得用于增强铜基材保护的超疏水自清洁表面。首先通过在铜基材上电化学辅助沉积甲基三乙氧基硅烷（MTES）前驱体溶液形成多孔且具有分级微纳结构的二氧化硅底涂层（溶胶-凝胶）。然后，用1H,1H,2H,2H-全氟辛基三乙氧基硅烷（PFOTS）制备具有低表面能的超疏水顶涂层（E-MTES/PFOTS）。该超疏水涂层对牛奶、可乐和油具有抗污性能，接触角分别为151°、151.5°和129°。电化学辅助沉积的电位和持续时间可有效控制微观形态、表面粗糙度和涂层厚度。E-MTES/PFOTS涂层对酸、碱具有化学稳定性，并且耐砂纸磨损。所提出的双层涂层系统在两个界面处表现出强化学键合，并提供具有持久超疏水性的刷状表面形态。所开发的方法将为在复杂表面上制备均匀的保护涂层提供一种环保且便捷的工艺。
