Superhydrophobic Al Surfaces with Properties of Anticorrosion and Reparability
Superhydrophobic Al Surfaces with Properties of Anticorrosion and Reparability
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DOI：
10.1021/acsomega.8b02631
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发表时间：
2018-12
期刊：
影响因子：
4.1
通讯作者：
Zhibing Zhan;Zihao Li;Zhi Yu;S. Singh;Chunlei Guo
中科院分区：
文献类型：
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作者：
Zhibing Zhan;Zihao Li;Zhi Yu;S. Singh;Chunlei Guo
铝（Al）是工业和家庭应用最广泛的金属之一，但它的寿命受到其腐蚀倾向的限制。在这项工作中，我们报告了一种简单的方法来制造具有优异防腐效果的超疏水铝表面。通过在CuCl2溶液中蚀刻Al，形成微纳米凹坑表面织构，然后在硬脂酸乙醇水溶液中降低其表面能，得到表面。超疏水铝表面的水接触角高达165°。电化学测试表明，超疏水改性后铝表面腐蚀速率下降94.5%（腐蚀电流密度由1.11 × 10-4降低到6.10 × 10-6 A cm-2）。我们还表明，即使在非常恶劣的环境下，超疏水表面也可以保护Al免受腐蚀。此外，我们的方法是可扩展的，超疏水表面表现出优异的柔韧性和可修复性。这种抗腐蚀的超疏水铝表面将延长铝的广泛使用。
Aluminum (Al) is one of the most widely used metals for industry and household applications, but its longevity is limited by its tendency for corrosion. In this work, we report a facile method to fabricate superhydrophobic Al surfaces that have excellent anti-corrosion effect. The surface is obtained by etching Al in CuCl2 solution to form the micro–nano-pit surface texture followed by lowering its surface energy in an aqueous ethanol solution of stearic acid. The superhydrophobic Al surfaces show water contact angles as high as 165°. Electrochemical tests demonstrate that the corrosion rate of the Al surface drops by 94.5% after the superhydrophobic modification (corrosion current density lowers from 1.11 × 10–4 to 6.10 × 10–6 A cm–2). We also show that the superhydrophobic surface will protect the Al from corrosion even under a very harsh environment. In addition, our method is scalable and the superhydrophobic surfaces exhibit excellent flexible and reparable properties. This anti-corrosive superhydrophobic Al surface will prolong Al in its broad usage.