Study On Fabrication Method And Performance For Functional Superhydrophobic Surface

With the development of society and the progress of science and technology,superhydrophobic surfaces have a broad application prospect in aerospace,automotive,glass and other fields with their unique functions.At present,the thermal,chemical,and mechanical stability of superhydrophobic surfaces have become the main obstacles that limit practical applications;in addition,traditional methods for preparing super-hydrophobic glass surfaces have low processing efficiency and high costs,and processing methods need to be improved urgently.In order to solve the above problems,superhydrophobic surfaces were prepared on magnesium,aluminum alloys and tungsten carbide materials by electrochemical and electro plating methods.The formation mechanism of micro/nano rough structure and its effect on surface wettability were studied,and the thermal,chemical and mechanical stability of the surfaces were compared and explored,and the comprehensive performance of the superhydrophobic surface prepared by the electro-precipitation method has been greatly improved.The microstructures processed by the above processing methods are randomly formed,in order to prepare deterministic microstructures,picosecond laser processing was used to prepare microstructures with controllable shapes and sizes,and the properties of the superhydrophobic surface were analyzed after modification.Finally,the superhydrophobic surface processed by electrochem ical etching,electrodeposition and laser were used as the mold substrate,the superhydrophobic surface was successfully prepared on the optical glass by the molding method.The specific research contents are as follows:（1）Super-hydrophobic surfaces were prepared on magnesium alloy and aluminum alloy materials by electrochemical etching.The surface morphology and wettability of different electrochemical etching times were analyzed to optimize the etching time,and the reason for the formation of micro-nano rough structure and the hydrophobic mechanism were theoretically analyzed.Subsequently,the thermal,chemical and mechanical stability of the superhydrophobic surface was explored,and the influence of processing technology,surface morphology,chemical composition and wettabi lity on the thermal stability of the surface was studied.The electrochemical polarization and the acid-base solution immersion test were carried out to evaluate the corrosion resistance of the surface by calculating the corrosion inhibition efficiency,the change of superhydrophobicity with the immersion time and observing the surface morphology.A mechanical friction and wear experiment was designed t o study the wear resistance of the surface,and the thermal,chemical and mechanical stability of the two surfaces were compared and analyzed.（2）In order to improve the chemical stability and mechanical stability of the magnesium and aluminum alloy surface,the electrodeposition method was used to deposit Ni-Si O₂ composite coating on the magnesium alloy and aluminum alloy material to prepare the superhydrophobic surface.The surface morphology,wettability,hardness and surface roughness of Ni-Si O₂ composite coatings with different time of electrodeposition and without Si O₂ particles were compared and analyzed.By optimizing the electrodeposition processing parameters,the HV value of the electrodeposited composite coating increased by 115%.In order to verify the thermal stability of the surfaces,a systematic study of the temperature resistance characteristics of the surface was carried out;electrochemical and acid-base solution immersion tests were carried out to analyze the chemical stability of the surface;the mechanical friction and wear experiments and sandpaper grinding experiments were designed to evaluate the mechanical stability of the surface,and at the same time compared with the superhydrophobic surface obtained by electrochemical met hod.In addition,a super-hydrophobic surface was also prepared by electrodeposition on tungsten carbide material,showing good thermal and chemical stability.（3）In order to control the processing shape and size of microstructures,picosecond laser processing was used to process microgroove array structures on magnesium,aluminum alloy and super-hard tungsten carbide materials,and the superhydrophobic surface was successfully prepared after modification with low surface energy.The wettability and finite element were combined to optimize the size parameters.Following performance analysis,it was found that the superhydrophobic surface of laser magnesium,aluminum alloy and tungsten carbide has good thermal stability after testing.The chemical stability of the superhydrophobic surface of tungsten carbide was better than that of the superhydrophobic surface of magnesium and aluminum alloy.（4）Using the superhydrophobic surface prepared by electrochemical,electrodeposition and laser processing method s as the mold substrate,it is proposed to use the molding method to mold the superhydrophobic glass on the glass surface.The wettability of the superhydrophobic surface of glass was explored,and the mechanism of fluorosilane self-assembly on the glass surface was theoretically analyzed.Finally,the thermal,chemical and mechanical stability of the surface was studied.