Preparation of Aluminum Superhydrophobic Surface with Nano-Micro Mixed Structure by SDBS/HCl Etching Method

The SDBS/HCl mixed solution was used to etch aluminum surface, and some nano-micro mixed structures were appeared on the surface. After modified by 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (FDTES), the aluminum surface was reached superhydrophobility, and the water contact angle was more than 160 degrees. The SEM experimental results showed that the aluminum superhydrophobic surface was of nano-micro mixed structure. According to the phenomenon, the bubble assisted etching mechanism ( pit-etching and dislocation etching) was used to primarily explain the cause of the two-step mixed structures. Moreover, the experiments of different pH and different exposure time showed the aluminum superhydrophobic was very stable.