Biomimetic hydrophobic surface fabricated by chemical etching method from hierarchically structured magnesium alloy substrate
Biomimetic hydrophobic surface fabricated by chemical etching method from hierarchically structured magnesium alloy substrate
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DOI：
10.1016/j.apsusc.2013.05.072
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发表时间：
2013-09-01
影响因子：
6.7
通讯作者：
Ren, Luquan
中科院分区：
文献类型：
--
作者：
Liu, Yan;Yin, Xiaoming;Ren, Luquan
镁合金作为最轻的金属材料之一，在汽车、飞机、电子产品等工业中发挥着重要作用。然而，镁合金由于其高化学活性和易腐蚀而受到阻碍。在这里，灵感来自典型的植物表面，如具有超疏水特性的荷叶和红玫瑰花瓣，新的疏水表面制备在镁合金上，通过两步方法来提高抗腐蚀性。实验过程为：先对样品进行激光处理，然后分别在浓度为0.1mol/L、0.3mol/L和0.5mol/L的AgNO 3水溶液中浸泡腐蚀15 s、40 s和60 s，最后用SiO2（CH 3（CH 2）（11）Si（OCH 3）（3））修饰。采用SEM、XPS、水接触角测定和电化学方法对涂层的微观结构、化学成分、润湿性和耐蚀性进行了表征。得到了具有微米级火山口状和纳米级花状二元结构的疏水表面。低能量的材料被包含在表面后退火处理。接触角可达138.4 ± 2 °，其疏水性能与微纳二元结构和化学组成有关。电化学测试结果表明，镁合金的耐蚀性能得到了提高。本研究为镁合金的防腐提供了一种从自然界启发的思路，同时该方法也易于推广到其他金属材料。(C)2013爱思唯尔有限公司版权所有。
As one of the lightest metal materials, magnesium alloy plays an important role in industry such as automobile, airplane and electronic product. However, magnesium alloy is hindered due to its high chemical activity and easily corroded. Here, inspired by typical plant surfaces such as lotus leaves and petals of red rose with super-hydrophobic character, the new hydrophobic surface is fabricated on magnesium alloy to improve anti-corrosion by two-step methodology. The procedure is that the samples are processed by laser first and then immersed and etched in the aqueous AgNO3 solution concentrations of 0.1 mol/L, 0.3 mol/L and 0.5 mol/L for different times of 15s, 40s and 60s, respectively, finally modified by DTS (CH3(CH2)(11)Si(OCH3)(3)). The microstructure, chemical composition, wettability and anti-corrosion are characterized by means of SEM, XPS, water contact angle measurement and electrochemical method. The hydrophobic surfaces with microscale crater-like and nanoscale flower-like binary structure are obtained. The low-energy material is contained in surface after DTS treatment. The contact angles could reach up to 138.4 +/- 2 degrees, which hydrophobic property is both related to the micro-nano binary structure and chemical composition. The results of electrochemical measurements show that anti-corrosion property of magnesium alloy is improved. Furthermore, our research is expected to create some ideas from natural enlightenment to improve anti-corrosion property of magnesium alloy while this method can be easily extended to other metal materials. (C) 2013 Elsevier B.V. All rights reserved.