Preparation and corrosion resistance and mechanical stability of superhydrophobic film on titanium alloy
An anodic oxide film was formed on the surface of Ti6A14V titanium alloy by anodic oxidation process as a transition layer,and SiO2 particles sol was sprayed and baked to form a sol film.A superhydrophobic film with micro-nano surface structure and the contact angle of 151.6 ° was prepared by surface modification with n-octyltriethoxysilane.The test results show that the main compo-nents of the superhydrophobic film are Ti,O,Si and C elements,and the corrosion current density is only 8.06×10-8 A/cm2,which is nearly an order of magnitude lower than that of bare titanium alloy,and the charge transfer resistance and low-frequency impedance mode value are increased by 7000 Ω·cm2 and 3000 Ω·cm2 respectively.The superhydrophobic film exhibits good corrosion resistance,and can be used as a corrosion-resistance film to protect titanium alloy.After 80 times of sand shakeout impact,50 times of tape stripping and reciprocating wear 400 cm along the sandpaper,the contact angle of the superhydrophobic film is still greater than 150 °,indicating that the superhydrophobic film maintaining the superhydrophobic state.The honeycomb porous anodic oxide film acts as the transition layer,which makes the sol film and the thin film formed after surface modification bond firmly with the titanium alloy matrix,thus the superhydrophobic film showing good mechanical stability.
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