两种硅烷偶联剂修饰的铝合金表面超疏水性能研究  

Superhydrophobic Properties of Aluminum Alloy Surfaces Modified by Two Silane Coupling Agents

作　　者：李文艳 杨含铭 夏祖西 彭华乔 石涛 LI Wen-yan;YANG Han-ming;XIA Zu-xi;PENG Hua-qiao;SHI Tao(The Second Research Institute of Civil Aviation Administration of China,Chengdu 610041,China;Key Laboratory of Aviation Fuel&Chemical Airworthiness and Green Development,Civil Aviation Administration of China,Chengdu 610041,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]中国民航局第二研究所,成都610041 [2]民航航油航化产品适航与绿色发展重点实验室,成都610041 [3]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《表面技术》2023年第9期340-350,共11页Surface Technology

基　　金：国家自然科学基金(U1833202)。

摘　　要：目的探究硅烷偶联剂对铝合金超疏水表面性能的影响。方法通过化学刻蚀并结合硅烷偶联剂修饰,在AMS 4037铝合金上制备超疏水表面。首先,通过HCl/H_(2)O_(2)混合液对铝合金进行刻蚀,在其表面构造具有多级蜂巢状的微/纳复合结构,再分别采用硅烷偶联剂和含氟硅烷进行疏水改性。详细研究2种改性剂的浓度对刻蚀铝合金表面润湿性的影响。采用接触角测量仪对材料表面润湿性和表面自由能进行测试,通过扫描电镜、能谱仪、激光共聚焦显微镜对表面微观结构和化学成分进行表征。同时,对2种硅烷偶联剂修饰的铝合金超疏水表面进行液滴冻结时间、防覆冰及自清洁行为测试。结果铝合金表面的疏水性并不总是与改性剂的浓度呈正相关。当改性剂的质量分数为0.5%时,经硅烷偶联剂修饰后其刻蚀表面的接触角为156.3°,但滚动角大于30°,而经含氟硅烷修饰后其表面的接触角可达164.4°,滚动角为6°。液滴在硅烷偶联剂和含氟硅烷修饰后的超疏水表面的冻结时间分别为37、45 s。结论相较于硅烷偶联剂修饰的刻蚀表面,含氟硅烷改性后其表面能更低,疏水效果更好。相较于未处理的铝合金表面,经硅烷偶联剂修饰后铝合金超疏水表面可显著抑制液滴的冻结过程,具有更长的冻结时间和延迟覆冰的能力,并且含氟硅烷修饰后表面的防冰性能更佳。自清洁实验也证明经含氟硅烷修饰后的表面具有更好的自清洁性能,其表面的微小灰尘颗粒更易被带走。In order to investigate the effects of the silane coupling agent on properties of superhydrophobic aluminum alloy surfaces,superhydrophobic surfaces were prepared on AMS 4037 aluminum alloy by chemical etching combining with modification of two kinds of silane coupling agents.Via an etching process with hydrochloric acid and hydrogen peroxide mixed solution,hierarchical honeycomb micro/nano structures were formed on AMS 4037 aluminum alloy surfaces.Then,the etched surface was treated with different concentrations of silane and fluorosilane,respectively.The effect of silane coupling concentration on wettability was also investigated systematically.The wettability and surface free energy of as-prepared samples were characterized and calculated by a contact angle meter.The microscopic appearance and chemical composition were analyzed by SEM,LSCM and energy spectrum.Meanwhile,the freezing process of water droplets on the surface with various wettability was observed with a high speed camera and the freezing time was calculated based on the video images.Anti-icing and self-cleaning behaviors of the surfaces treated with two modifiers were tested respectively.The results showed that the hydrophobicity of as-prepared samples was not always positively related to the concentration of the silane coupling.When the modifier was 0.5wt.%,the contact angle of the etched surface treated with silane coupling agent was 156.3°,but the sliding angle was more than 30°,while the fluorosilane-modified surface reached a maximum contact angle of 164.4°and a rolling angle of 6°,which was definitely a superhydrophobic surface.When the concentration of modifiers continued to increase,the hydrophobicity of both surfaces became worse,which may be due to the effect of the way in which the surface modifier molecules were packed.The freezing time of water droplets with a volume of 5μL on the superhydrophobic surface modified by silane coupling agent and the fluorosilane was divided into 37 s and 45 s,respectively.And the lower freezing fron

关 键 词：铝合金 超疏水 冻结时间 结霜 自清洁 

分 类 号：O69[理学—化学]