化工学报 ›› 2020, Vol. 71 ›› Issue (10): 4750-4759.DOI: 10.11949/0438-1157.20200591

• 表面与界面工程 • 上一篇    下一篇

铝合金表面耐久性超疏水防护膜的制备与表征

刘雷(),张粤,李霞,雷惊雷,李凌杰()   

  1. 重庆大学化学化工学院,重庆 400044
  • 收稿日期:2020-05-15 修回日期:2020-05-27 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: 李凌杰
  • 作者简介:刘雷(1989—),男,博士研究生,291649902@163.com
  • 基金资助:
    国家自然科学基金项目(21773019);重庆市研究生科研创新项目(CYB18044);重庆大学大型仪器基金项目

Preparation and characterization of durable superhydrophobic protective coatings on aluminum alloy

Lei LIU(),Yue ZHANG,Xia LI,Jinglei LEI,Lingjie LI()   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2020-05-15 Revised:2020-05-27 Online:2020-10-05 Published:2020-10-05
  • Contact: Lingjie LI

摘要:

通过酸刻蚀-沸水浴处理构筑微纳米分级结构,进而通过喷涂含有磷酸铝胶黏剂(AP)和低表面能物质——全氟辛基三氯硅烷(PFOTS)的悬浮液增强结合力并降低表面能,从而在国产7B04铝合金表面制备了耐久性超疏水防护膜。利用场发射扫描电子显微镜(FESEM)、X射线光电子能谱仪(XPS)、傅里叶变换红外光谱仪(FTIR)、接触角测试仪(CA)、电化学阻抗谱(EIS)等技术以及多种环境模拟实验对样品进行了表征,结果显示,制备的防护膜表面水静态接触角(WCA)高达158.4°,滑动角(SA)为0°,呈现出超疏水和低黏附性;膜层电阻(Rc)约为101.55 kΩ·cm2,在NaCl腐蚀介质中的电荷转移电阻(Rt)增大了近2个数量级,表现出优异的防护性能;样品可以经受多种破坏,具有理想的机械耐久性、化学耐久性和环境耐久性。

关键词: 铝合金, 表面润湿性, 腐蚀, 防护, 电化学, 耐久性

Abstract:

The durable superhydrophobic protective coatings on the 7B04 aluminum alloy surface was prepared by using acid etching and boiling water bath to construct micro-nano hierarchical structure, and then spraying suspension containing aluminum phosphate adhesive (AP) and perfluorooctyltrichlorosilane (PFOTS) to increase adhesion and reduce surface energy. The samples were characterized by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), contact angle measurement (CA), electrochemical impedance spectroscopy(EIS) and a variety of the environmental simulation experiments. The results showed that the static water contact angle (WCA) of the surface is 158.4° and the slide angle (SA) is about 0°, suggesting superhydrophobicity and low adhesion to water. The coating resistance (Rc) was as high as 101.55 kΩ· cm2 and the charge transfer resistance (Rt) in NaCl corrosion medium increased by nearly two orders of magnitude, showing excellent protective performance. The sample can withstand a variety of damages, with ideal mechanical durability, chemical durability and environmental durability.

Key words: aluminum alloy, surface wettability, corrosion, protection, electrochemistry, durability

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