Preparation and characterization of superhydrophobic surface on Al-Mg-Si alloy with different adhesive forces

Rough structure of Al-Mg-Si alloy substrates were acquired by immersing in solution based on discocation etching.Self-assembled monolayers of perfluorodecyltrichlorosilane was prepared on rough surface by self-assembled method.The characterization of surface properties of specimens was conducted with X-ray diffractometer,scanning electron microscope and surface profiler.Contact angle measurement was used to analyse the surface wettability.The results indicate that the wettability of substrate convert from hydrophilicity to superhydrophilicity and superhydrophobicity after solution immersing and self-assembled monolayers depositon.Different rough structure of Al-Mg-Si alloy substrates were acquired by changing immersing time;superhydrophobic surface with different adhesive force were prepared by changing the solution immersing time.The analysis indicate that rough structure of specimens by solution immersing and low surface energy material FDTS self-assembled monolayers are the main factors for superhydrophobicity.The different adhesive forces are caused by the different state of water droplets on the superhydrophobic surface with different surface roughness.