Superhydrophobic Surface Construction And Properties Of Zr-based Bulk Amorphous Alloys

As a new emerging material,biomimetic superhydrophobic materials have received extensive attention in recent years,and their unique hydrophobic properties make them show great potential in both basic science and manufacturing.At present,many achievements have been made in superhydrophobic research in the fields of organic polymers such as nanotubes,industrial resins and textiles.However,these superhydrophobic materials have limited their applications due to their poor wear resistance and low adhesion between the hydrophobic layer and the substrate.Traditional metal materials have structural defects and high surface energy,and surface superhydrophobicization is not easy to achieve.In contrast,the disordered structure of bulk amorphous alloy(BMG)brings its unique mechanical,physical and chemical properties,which make it have broad application potential in the fields of industry and medical materials.In addition,it has superplasticity in the supercooled liquid phase region,which can realize the precision machining of the material.At present,there are few studies on the surface hydrophobicity and biocompatibility of amorphous alloys,and the preparation methods are also cumbersome and expensive.Therefore,it is of great practical significance to adopt an economical and efficient method to realize the multifunctional hydrophobic surface of amorphous alloys.In this paper,a fast and efficient anodic etching method was used to realize the preparation of Zr-based amorphous alloy superhydrophobic surface.The main findings are as follows:(1)Zr_53.9Cu_29.4Al_9.8Ni_4.9Y₂ amorphous alloy was used as the substrate,which was first placed in a 1.0 vol%HCl solution for electrochemical etching.It was then modified by soaking in 1.0 vol%perfluorooctyltriethoxysilane(PTES)to obtain a superhydrophobic surface.The surface static contact angle of the sample is 154°±2°,and the sliding contact angle is 4°±2°.The electrochemical test results showed that the self-corrosion current density of the superhydrophobic sample decreased by 2 orders of magnitude compared to the original sample,and the corrosion inhibition rate reached 98.50%.The results of the water drop impact test and abrasion test show that the superhydrophobic samples have good mechanical durability.The standing test,immersion test and temperature resistance test show that the superhydrophobic samples have excellent chemical stability.In addition,the superhydrophobic samples exhibited excellent self-cleaning performance in the antifouling test.(2)Using Zr₅₆Al₁₆Co₂₈ amorphous alloy as the experimental matrix,anodic galvanostatic etching was carried out in 0.25 M Na Br solution,so that the surface of the sample showed a honeycomb micro-nano composite structure.The surface was further modified with a stearic acid solution to achieve superhydrophobicity.The wettability test results show that the surface static contact angle is 160°±2°,and the rolling contact angle is 2°±1°.The polarization test results show that the superhydrophobic samples can still maintain good corrosion resistance after being immersed in the SBF simulated human body solution for 6 days.The blood test results show that the surface of superhydrophobic BMG can effectively inhibit platelet adhesion,and the hemolysis rate is only 0.24%,which has an excellent anticoagulant ability.In addition,the superhydrophobic Zr₅₆Al₁₆Co₂₈ BMG can resist UV irradiation,wear resistance,high temperature and water impact,showing its potential value in the field of medical devices.(3)Zr₅₆Al₁₆(Co_0.75Ag_0.25)₂₈ BMG was used as an experimental substrate and anodized in a 0.25 M Na Br solution.Micro-nano composite structures were etched on the sample surface and modified by stearic acid to achieve superhydrophobic properties.The test results show that the static contact angle is 158°±2°and the sliding contact angle is 2°±1°.Electrochemical test results show that the superhydrophobic samples can still maintain corrosion resistance after immersion in SBF simulated human body solution for 3 days.Cell adhesion test results show that both the superhydrophobic surfaces of Zr-Al-Co and Zr-Al-Co-Ag BMG can effectively inhibit the attachment of smooth muscle cells.The bacteria resistance test results show that the superhydrophobic Zr-Al-Co(-Ag)BMG can effectively inhibit the adhesion of Escherichia coli,and the Zr-Al-Co-Ag BMG has stronger bactericidal ability.In addition,the superhydrophobic Zr-Al-Co-Ag BMG samples exhibited good mechanical durability and chemical stability in the temperature resistance test,UV resistance test,water impact resistance and abrasion resistance test.The above results show that it has good application potential in medical implants and other fields.