Fabrication Of Stainless Steel Superhydroph Obic Surface And The Anti-icing Properties

Ice is a common phenomenon in nature.When ice brings people visual enjoyment,but also causes serious losses and even disasters to people’s life and industrial production.Therefore,the study of anti-icing is an important issue.In recent years,,people have found that superhydrophobic surface has anti-icing properties with the further study of superhydrophobic surface.In this thesis,two kinds of stainless steel super-hydrophobic surfaces were prepared by etching and spraying method.The anti-icing performance of superhydrophobic surface was studied by self-made icing test equipment.The main research contents are as follows:(1)The stainless steel superhydrophobic surface was prepared by using hydrofluoric acid etching and low surface energy modification.The effects of etching temperature and etching time on the surface microstructure were investigated,as well as the effects of different modifiers and concentration on surface wettability.The results showed that etching temperature of 40 ℃,etching time of 9 min and perfluorodecyltrimethoxysilane-ethanol solution with concentration of 1wt‰ were the best condition to prepare the stainless steel superhydrophobic surface.The as-prepared superhydrophobic surface with the water contact angle of 166.1° and sliding angle of6.0°,which exhibited good stability and corrosion resistance.(2)The stainless steel superhydrophobic coating with the water contact angle of reach to 166.5° and the siliding angle as low as 1° was prepared by spraying benzoxazine and polytetrafluoroethylene on the stainless steel substrate after curing at high temperature,which has good stability.The effects of polytetrafluoroethylene content on surface roughness and morphology as well as surface wettability were investigated.The results showed that the optimum content of polytetrafluoroethylene was 60 wt%.(3)The icing process of stainless steel hydrophilic surface,hydrophobic surface and two kinds of superhydrophobic surfaces were studied by the self-made icing test equipment..The results showed that the water on the superhydrophobic surface before icing was larger than that of the hydrophilic surface and the hydrophobic surface under the same low temperature condition.At the same time,the time required for super-hydrophobic surface water droplets to freeze was longer than that of hydrophilic surfaces and hydrophobic surfaces,which indicated that superhydrophobic surfaceshave the effect of delaying water droplets icing.The binding capacity of ice layer on different wetting surfaces was tested.It was found that the binding capacity of superhydrophobic surface ice and substrate surface was the smallest in the same temperature environment.