Fabrication of the superhydrophobic surface on aluminum alloy by anodizing and polymeric coating

详细信息    查看全文

• 作者：Wenyong Liu^a ; ^b ; ^{lwy@iccas.ac.cn} ; Yuting Luo^b ; Linyu Sun^b ; Ruomei Wu^b ; ^{cailiaodian2004@126.com} ; Haiyun Jiang^b ; Yuejun Liu^a ; ^b
• 关键词：Superhydrophobic surface ; Anodizing ; Polymeric coating ; Aluminum alloy
• 刊名：Applied Surface Science
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：264
• 期：Complete
• 页码：872-878
• 全文大小：754 K

文摘

We reported the preparation of the superhydrophobic surface on aluminum alloy via anodizing and polymeric coating. Both the different anodizing processes and different polymeric coatings of aluminum alloy were investigated. The effects of different anodizing conditions, such as electrolyte concentration, anodization time and current on the superhydrophobic surface were discussed. The results showed that a good superhydrophobic surface was facilely fabricated by polypropylene (PP) coating after anodizing. The optimum conditions for anodizing were determined by orthogonal experiments. When the concentration of oxalic acid was 10 g/L, the concentration of NaCl was 1.25 g/L, anodization time was 40 min, and anodization current was 0.4 A, the best superhydrophobic surface on aluminum alloy with the contact angle (CA) of 162¡ã and the sliding angle of 2¡ã was obtained. On the other hand, the different polymeric coatings, such as polystyrene (PS), polypropylene (PP) and polypropylene grafting maleic anhydride (PP-g-MAH) were used to coat the aluminum alloy surface after anodizing. The results showed that the superhydrophobicity was most excellent by coating PP, while the duration of the hydrophobic surface was poor. By modifying the surface with the silane coupling agent before PP coating, the duration of the superhydrophobic surface was improved. The morphologies of the superhydrophobic surface were further confirmed by optical microscope (OM) and scanning electron microscope (SEM). Combined with the material of PP with the low surface free energy, the micro/nano-structures of the surface resulted in the superhydrophobicity of the aluminum alloy surface.