Study On Surface Strength And Anti-Ice Properties Of Fluorine-Containing And Nano-Particle Superhydrophobic Coatings

Ice can bring a lot of inconvenience to daily life.For example,icing can lead to heavy ice covering of polar sailing ships,increasing hull weight and ship drag.Icing of wind turbine blades will increase the surface roughness,increase the resistance of blades and destroy their aerodynamic performance.Icing on engine air intakes,leading edge wings,cockpit glass and some external sensors can affect an aircraft’s economy and handling,and even lead to a crash.The traditional anti-icing methods include electric heating method,gas heating method and so on,but these methods have the limitations of large energy consumption,complex structure and so on.In view of these shortcomings,this thesis proposed to use 7075 aluminum alloy as the base material,silicon dioxide,polytetrafluoroethylene,as the main raw materials,through spraying method to prepare a low energy consumption,simple manufacturing process,engineering feasibility of the super hydrophobic anti-ice coating.The main research contents and experimental results of this thesis are as follows:(1)The influence of spraying distance,relative spraying speed and spraying times on the contact Angle of coating was analyzed,and an optimal spraying process was determined.It was found that when the spraying distance was 15.8cm,the relative motion rate was 52.6mm/s,and the spraying times were 15,the superhydrophobic performance of the coating was the best,and the maximum contact Angle was 164.4° and the rolling Angle was 1°.(2)The effects of low temperature duration,sample tilt Angle and icing temperature on the anti-icing performance of superhydrophobic surface in the icing environment were analyzed.It is found that with the increase of the duration of low temperature,the mass of water droplets on the superhydrophobic surface increases and the water droplets capture rate decreases.With the increase of the sample tilt Angle,the mass of water droplets on the superhydrophobic surface decreases,and the water droplets capture rate decreases.With the decrease of freezing temperature,the mass of water drop capture increases and the water drop capture rate increases.(3)The wear resistance of the superhydrophobic surface was optimized by spraying polytetrafluoroethylene on the original superhydrophobic surface,and the influence of different wear loads and different wear times on the wear resistance of the superhydrophobic surface was analyzed.It was found that with the increase of the number of polytetrafluoroethylene spraying layers on the original superhydrophobic surface,the wear resistance of the superhydrophobic surface would improve,but the superhydrophobic property would decrease.With the increase of wear frequency and wear load,the maximum wear frequency of superhydrophobic surface decreases.(4)The influence of droplet volume and falling height on the contact characteristics between superhydrophobic surface and droplet is analyzed.It is found that with the increase of water drop volume and falling height,the bounce of water drop increases first and then decreases,and the spreading diameter of water drop increases.(5)The influence of corrosion duration and corrosion intensity on the corrosion resistance of superhydrophobic surface was analyzed.It is found that the maximum corrosion resistance time of superhydrophobic surface decreases with the increase of corrosion duration and corrosion intensity.