School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China.
ACS Appl Mater Interfaces. 2011 Nov;3(11):4404-14. doi: 10.1021/am2010527. Epub 2011 Nov 1.
A superhydrophobic magnesium (Mg) alloy surface was successfully fabricated via a facile electrochemical machining process, and subsequently covered with a fluoroalkylsilane (FAS) film. The surface morphologies and chemical compositions were investigated using a scanning electron microscope (SEM) equipped with an energy-dispersive spectroscopy (EDS) and a Fourier-transform infrared spectrophotometer (FTIR). The results show hierarchal rough structures and an FAS film with a low surface energy on the Mg alloy surfaces, which confers good superhydrophobicity with a water contact angle of 165.2° and a water tilting angle of approximately 2°. The processing conditions, such as the processing time and removal rate per unit area at a constant removal mass per unit area, were investigated to determine their effects on the superhydrophobicity. Interestingly, when the removal mass per unit area is constant at approximately 11.10 mg/cm(2), the superhydrophobicity does not change with the removal rate per unit area. Therefore, a superhydrophobic Mg alloy surface can be rapidly fabricated based on this property. A large-area superhydrophobic Mg alloy surface was also fabricated for the first time using a small-area moving cathode. The corrosion resistance and durability of the superhydrophobic surfaces were also examined.
通过简单的电化学加工工艺成功制备了超疏水镁（Mg）合金表面，随后在其表面覆盖氟烷基硅烷（FAS）薄膜。采用配备能量色散光谱仪（EDS）和傅里叶变换红外分光光度计（FTIR）的扫描电子显微镜（SEM）对表面形貌和化学成分进行了研究。结果表明，Mg 合金表面具有分层粗糙结构和低表面能的 FAS 薄膜，其水接触角为 165.2°，水倾斜角约为 2°，具有良好的超疏水性。研究了加工条件，如在单位面积去除质量恒定时的加工时间和单位面积去除率，以确定它们对超疏水性的影响。有趣的是，当单位面积去除质量恒定时（约为 11.10mg/cm2），单位面积去除率的变化对超疏水性没有影响。因此，可以根据这一特性快速制备超疏水 Mg 合金表面。首次使用小面积移动阴极制备了大面积超疏水 Mg 合金表面。还对超疏水表面的耐腐蚀性和耐久性进行了研究。
