| Aluminum have good electrical conductivity,thermal conductivity,ductility and machinability.They are widely used in daily life and production.In the face of different application environments,aluminum alloy products may have surface contamination,corrosion and icing problems,resulting in economic losses and safe use problems.The superhydrophobicization of aluminum and aluminum alloy surfaces can effectively alleviate these problems.In this paper,the superhydrophobic aluminum alloy surface was prepared by constructing a rough structure on the surface of aluminum alloy and reducing the surface energy.The main research results are as follows:?1?The surface of the aluminum alloy was etched with a 3 mol/L HCl solution to construct a micro-nano roughness structure to obtain a hydrophilic surface,and the sample was immersed in a perfluorodecyltriethoxysilane solution for 30 min to reduce the surface energy,superhydrophobicity was achieved.The effect of different etching time on the surface wettability of the sample was studied,The results showed that the sample with 15 min etching has the largest contact angle and the maximum value was 154.2°,At this time,the rolling angle was 5°,which was superhydropho-bic.The sample was tested for atmospheric stability,indicating that after standing in the air for 100 days,the surface contact angle was reduced to 152.3°,which was sti-ll superhydrophobic.The abrasion resistance test showed that when the friction dista nce was 1030cm,the contact angle was more than 150°,which had superhydropho-biceffect,and when it was more than 40 cm,the contact angle was less than 150°,and the superhydrophobic effect was lost.Self-cleaning tests showed that superhydrop-hobic surfaces had excellent self-cleaning properties.Compared with the original alum-inum alloy surface,the self-corrosion current of the sample increased by 4.586×10-6?·cm-2,the impedance value decreased by 1368?·cm2,and the corrosion resistance decreased relatively.The anti-icing test showed that the surface of the superhydropho-bic sample prolonged the freezing process of water droplets by 26 min,and in the dynamic dripping process,there was no icing on the superhydrophobic surface,which effectively improved the anti-icing performance of the substrate.?2?On the aluminum alloy substrate etched for 15 min with 3 mol/L HCl,TiN film was deposited by magnetron sputtering equipment to construct a rough surfac structure,and each sample was immersed in perfluorodecyltriethoxysilane solution for30 min to reduce surface energy,eventually achieving a superhydrophobic effect.The effects of different deposition time on the surface of the sample were studied.It was found that when the deposition time was 2 h,the contact angle was the largest,and the maximum value was 153.5°±0.5°,and the roll angle was 8°.The sample was characterized by atmospheric stability and found to have a surface contact angle drop of 150.5°after standing for 100 days in the atmosphere.The wear test showed that when the friction distance was 1050 cm,the contact angle was still greater than150°.When it was greater than 50 cm,the contact angle started to be less than 150°,and the superhydrophobic effect was lost.Self-cleaning tests showed that superhydro-phobic surfaces had good self-cleaning properties.Compared with the original alumi-num alloy,the self-corrosion current of the superhydrophobic sample was reduced by an order of magnitude,the impedance value was increased by 4022?·cm2,and the corrosion resistance was relatively improved.?3?A superhydrophobic surface was prepared by applying a PDMS?polydimethy-lsiloxane?/SiO2 mixed solution to an aluminum alloy substrate etched with HCl for15 min by using a pulling impregnation method.The effects of different content of SiO2 on surface wettability and properties were studied.The results showed that when the content of SiO2 was 0.6 g,the contact angle was the largest,the maximum val ue was 162.3°,and the rolling angle was 3°.After the sample was allowed to stand in the atmosphere for 100 days,the contact angle still reached 160°,and the super-hydrophobic coating was substantially unaffected by the atmospheric environment.The abrasion resistance test showed that the contact angle was greater than 150°when the friction distance was 1060 cm.When the distance was greater than 60 cm,the contact angle of the sample began to be less than 150°,and the superhydrophobicity was lost.However,the contact angle of the sample was above 140°until rubbed to150 cm.The self-cleaning performance indicated that the superhydrophobic surface was superiorin self-cleaning property.Compared with the original aluminum alloy,the superhydrophobic sample was reduced by 2 orders of magnitude from the corrosion current,and the impedance value was increased by 11344?·cm2,and the corrosion resistance was improved. |
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