Bio-inspiredly fabricating the hierarchical 3D porous structure superhydrophobic surfaces for corrosion prevention
Bio-inspiredly fabricating the hierarchical 3D porous structure superhydrophobic surfaces for corrosion prevention
复制标题
仿生制造分层 3D 多孔结构超疏水表面以防止腐蚀
DOI：
10.1016/j.matdes.2016.04.083
复制
发表时间：
2016-08-05
影响因子：
8.4
通讯作者：
Jiang, Hailin
中科院分区：
文献类型：
--
作者：
Lin, Yuebin;Shen, Yizhou;Jiang, Hailin
生物仿生超疏水表面的基础研究已经发展了几十年，在丰富的自然灵感的启发下，各种具有特殊润湿性的功能表面已经被人工制造出来，但仍然没有打破超疏水表面应用停滞不前的困境。为此，我们开发了一种喷砂和两步化学腐蚀相结合的方法在Ti6Al4V衬底上形成层次化的3D(三维)孔结构，并获得了良好的超疏水性能，经氟烷基硅烷改性后，其表观接触角达到160度，接触角滞后仅为3度。这主要归功于层次化的3D多孔结构具有巨大的孔隙率，并显示出更高的捕获大量流动气囊的能力。此外，基于捕集空气层限制氯离子迁移的机制，超疏水表面表现出很好的防腐性能，腐蚀电流密度(I(Corr))降低了三个数量级，腐蚀电位(E-corr)增加了0.26V.(C)2016爱思唯尔有限公司。
The fundamental investigations on the bio-inspired superhydrophobic surfaces have been developed for decades, and various functional surfaces with the special wettability have been artificially fabricated under the abundant inspirations from nature, yet it do not still break the predicaments of the stagnant applications of superhydrophobic surfaces. Herein, we developed a facile combined strategy of sand blasting and two-step chemical etching for the creation of hierarchical 3D (three dimensional) porous structures on Ti6Al4V substrate, and obtained excellent superhydrophobicity with the apparent contact angle reaching 160 degrees and the contact angle hysteresis of only 3 degrees after the modification of fluoroalkylsilane. This mainly attributed to the hierarchical 3D porous structures possessing the huge porosity, and exhibiting a higher capacity to trap a large amount of flowing air pockets. Furthermore, based on the mechanism of the trapped air layer restricting the transport of Cl-, the superhydrophobic surfaces displayed a great corrosion prevention performance with the corrosion current density (i(corr)) lowering three orders of magnitude and the corrosion potential (E-corr) increasing 0.26 V. (C) 2016 Elsevier Ltd. All rights reserved.