Construction Of Hydrophobic Surface On Zr-based Bulk Metallic Glasses

Based on the self-cleaning effect of lotus leaf surface,the hydrophobicity of the surface of the material is widely concerned.The superhydrophobic performance of the surface is one of the hotspots in the field of materials,bionic and macromolecule.For solid materials,the surface energy and surface microstructures are the most critical factors determining the surface superhydrophobicity.Conventional metal materials due to their own grain size and grain boundary effect makes it difficult to construct the ideal micro-nano composite structure on its surface,and its mechanical properties and corrosion resistance and other aspects of its limitations,leading to even in its surface structure of micro-nano Composite structure,the application of the material is also subject to greater restrictions.The amorphous alloy of high strength,high hardness and high corrosion resistance and other aspects have a unique advantage,with a wide range of applications.(Zr_0.55Cu_0.3Al_0.1Ni_0.05)₉₈Y₂ and(Zr_0.58Nb_0.03Cu_0.16lNi_0.13Al_0.10)98Lu2 bulk amorphous alloy were prepared by using the amorphous alloy with large forming ability,large glass performance and high thermal stability.The surface of the study was constructed by chemical immersion corrosion and electrochemical corrosion,and the surface was modified by low surface energy to obtain hydrophobic surface.The results showed that the surface contact angle of(Zr_0.55Cu_0.3Al_0.1Ni_0.05)₉₈Y₂ sample did not increase obviously after the different proportions of HF:H₂O₂:H₂O etching solution,indicating that the surface hydrophobicity did not improve obviously.The(Zr_0.58Nb_0.03Cu_0.16Ni_0.13Al_0.10)₉₈Lu₂ samples were etched at HF:H₂O₂:H₂O=1:1:12（in ml）at a rate of 1min,etched 10 times,and their surface contact angle From the untreated 57° to 98°,the hydrophobic properties of the sample surface from the hydrophilicity before corrosion into hydrophobic.SEM analysis shows that the surface after the formation of micro-pores,there are many micro-nano-scale particles around.These microns and nanostructures together form a micro-nanocomposite structure on the surface of the specimen.The result showed that the(Zr_0.55Cu_0.3Al_0.1Ni_0.05)₉₈Y₂ sample in 5vol%hydrochloric acid solution,50 m A constant current corrosion for 45 min,the surface contact angle from the non-corrosion before the 67° to 153°.Its surface from hydrophilic to superhydrophobic characteristics.SEM observation showed that the surface of the sample was evenly distributed with micro-pores,and the pores were covered with microns,and the granular nano-bumps were distributed on the bumps to form a micro-nanocomposite structure.Under the same conditions,the(Zr_0.58Nb_0.03Cu_0.16Ni_0.13Al_0.10)₉₈Lu₂ sample corrosion 35 min after the surface contact angle from the non-etching before the increase of 57° to 148°.SEM analysis showed that after the corrosion,the surface of the sample is evenly distributed with micron-sized pores,and there are smaller nano-protrusions on the spherical particles around the pores.These microstructures are intertwined to form a micro-nanocomposite structure.