浸泡法快速制备超疏水黄铜表面

采用化学蚀刻和溶液浸泡相结合的方法制备具有超疏水性的黄铜表面.按比例配置HCl、HNO3和HF的混合溶液蚀刻黄铜，蚀刻后用硬脂酸溶液进行修饰以获得接触角大于150°的表面.通过扫描电镜对表面结构的观察以及能谱分析，发现蚀刻后的表面具有片状和微小乳突组成的微/纳二级结构，修饰后的这些结构可以捕获大量空气.根据Cassie模式的计算方程，水滴与空气的接触面积约占总接触面积的94.11%.实验研究了不同蚀刻时间对试件表面润湿性的影响，理论分析微结构的形成机理.发现最佳制备条件为：蚀刻时间5 min，浸泡时间1 h，此条件下制备的试件的接触角达到164.5°.

Fast Fabrication of Super-hydrophobic Brass Surface Using Solution Immersion Method

A chemical etching method combined with solution immersion was developed to fabricate super-hydrophobic brass surface. HCl, HNO3 and HF were mixed according to a certain percentages in the solution to etch brass which was treated with stearic acid. Inspected with scanning electron microscope, the etched surface morphology was found formed with double scales of hierarchical sheeted and papillary structures which could store lots of air. According to Cassie function, about 94.11% of the contact proportion is between water and air cushion. This research studied the effect of different etching time and analyzed the formation mechanism of these nano-structures. The best fabrication conditions were: 5 min of etching time and 1h of immersion time, which made the surface to have a WCA of 164.5°.