The Study On Preparation And Properties Of Superhydrophobic Surface Of Zr-Cu-Al-(Ag) Metallic Glasses

Natural phenomena have guided humans to develop science and find out novel answers.Mimicking nature has been considered an important technique in materials science to develop different materials.The natural superhydrophobicity in plants like lotus leaves and animals like gecko feet as a fantastic event attracts scientists The super-hydrophobic surface shows great industrial application prospects due to its characteristics,such as self-cleaning,anti-icing and oil-water separation.Therefore,the preparation of superhydrophobic surfaces has become a research hotspot in the fields of bionics,materials science and physics.Generally,to fabricate artificial super-hydrophobic surface,it is necessary to increase the surface roughness and lower the surface free energy.In this paper,micro-nano composite structures were constructed on the surface of Zr-based metallic glasses by electrochemical etching,and then a super-hydrophobic surface was successfully prepared by chemical modification with low surface energy substances.Scanning electron microscope（SEM）,energy spectrum analyzer（EDS）,infrared spectrometer（FTIR）,static contact angle measuring instrument,potential dynamic polarization and electrochemical impedance were used to perform surface morphology,chemical composition,Characterization of wettability,corrosion resistance and a series of other properties.The results are as follows:（1）The Zr₄₆Cu₄₆Al₈ metallic glasses is electrochemically etched in 3.5 wt.%NaCl solution to obtain coral reef-like micro-nano composite structures on the surface.After being immersed in 8 mmol/L stearic acid acetone solution,the contact angle with water is154.3°±2.2°and a super-hydrophobic surface with a rolling angle of<5°.Tafel curve and EIS confirmed that the superhydrophobic samples showed excellent corrosion resistance,the corrosion current density dropped by three orders of magnitude,and the inhibition rate was as high as 99.6%.The experiment of placing droplets of different p H on the surface of the sample and the temperature resistance experiment further prove that the superhydrophobic sample also has excellent chemical stability.The study found that the superhydrophobic sample has good self-cleaning performance,and the pulling experiment shows that the adhesion of the superhydrophobic surface is low.（2）The Zr₄₆Cu₄₆Al₈ metallic glasses surface with honeycomb micro-nano composite structures were constructed by electrochemical etching in a mixed solution of 0.03 M NaCl and 0.20 M NaBr.The surface of the sample was modified by stearic acid to achieve superhydrophobicity and superoleophobicity.The contact angles with glycerol reached157.3°±2.1°and 153.2°±0.6°,respectively.Potentiodynamic polarisation test and EIS test in PBS simulated human body solution found that the sample has good corrosion resistance,the corrosion current density has dropped by an order of magnitude,and the impedance value has increased by 12.3 times.The wear test proves that the sample has good mechanical stability.The study found that after the sample loses superhydrophobicity after ultraviolet irradiation,the superhydrophobic ability will be restored after heat treatment,which proves that the superhydrophobic film has the self-repairing ability.（3）In a mixed solution of 0.03 M NaCl and 0.25 M NaBr,micro-nano composite structures were constructed on the surface of the Zr₄₆(Cu_4.5/5.5Ag_1/5.5)₄₆Al₈ bulk metallic glasses by electrochemical etching.After being modified by fluorosilane,a superhydrophobic surface was prepared,and the contact angle with water reaches155.3°±1.3°,and the rolling angle is less than 5°.The heat and cold cycle experiment,tape stripping experiment,water impact experiment and immersion experiment proved that the prepared superhydrophobic surface has good stability and durability.