5A05铝合金表面超疏水结构的制备及耐腐蚀性（英文）

Fabrication of Superhydrophobic Structure on 5A05 Aluminum Alloy Surface and Its Corrosion Resistance

以5A05铝合金为研究对象,提出一种简单的低成本超疏水结构制备方法,实现了超疏水/耐腐蚀表面的可控构筑。采用电火花线切割技术,对基材表面进行微米级褶皱与纳米级凹坑结构的一步高效制备,并对结构改性后的润湿性和耐腐蚀性进行系统测量与表征。结果表明,改性后的表面水滴静态接触角高达152.7°,滚动角仅为7.1°,表现出优异的超疏水性。进一步的电化学测试结果表明,超疏水表面通过改变界面作用行为,减弱了固-气-液复合接触界面间腐蚀介质的作用行为与过程,对表面耐腐蚀性产生决定性影响,明显提高了材料的抗腐蚀性。

This work developed a simple and low-cost method to achieve superior superhydrophobicity and corrosion resistance of 5A05 Al alloy.The microscale wrinkles covered with nanoscale craters were prepared by a one-step wire electrical discharge machining process.Meanwhile,the wettability and corrosion resistance of the as-prepared structures were investigated after the low-surface-energy modification.The results show that the modified surface exhibits excellent superhydrophobicity with a water contact angle（CA）of 152.7° and a rolling angle（RA）of 7.1°.Furthermore,its corrosion resistance was assessed by electrochemical tests.Ultimately,owing to the trapped air in micro-nano structures,the solid-air-liquid interface helps to resist seawater penetration on the superhydrophobic surface and significantly enhances its corrosion resistance.