| Common ultra-hydrophilic,ultra-hydrophobic,ultra-lipophilic and ultra-oleopho-bic surfaces have great application value in the fields of self-cleaning,fluid drag reduc-tion,anti-icing,fluid transportation,and oil-water separation.Zr-based amorphous al-loy has the comprehensive advantages of high yield strength,high hardness,high frac-ture toughness,good fatigue resistance and high corrosion resistance,and at the same time has good biocompatibility.Therefore,it is of great significance to prepare an ex-tremely wettability surface on the Zr-based amorphous alloy substrate.In this paper,Zr62.5Cu22.5Al10Fe5bulk amorphous alloy is selected as the research object.In the same electrolyte(the solute is Na Cl,the solvent is the mixed solution of equal volume of glycerin deionized water),the surface of the sample was etched under constant pressure under different voltages to obtain ultra-wet surfaces such as under-water super-oleophobic,high-adhesion super-hydrophobic,low-adhesion super-hydro-phobic,and super-hydrophobic and high-oleophobic.Preparation of highly adherent superhydrophobic surfaces in the air.A rough coral reef-like microstructure and a large number of filamentous nanostructures distributed on the surface of the amorphous alloy are obtained by 3 V constant voltage electro-chemical etching.The surface is super-phobic after being modified by the green envi-ronmentally friendly low-surface-energy substance stearic acid.The water droplets can adhere firmly to the surface,even if the sample is rotated by 90°or 180°,the water droplets will not fall off.Studies have shown that the surface has good pressure re-sistance,acid resistance and abrasion resistance,but it has poor corrosion resistance in strong alkaline solutions and salt solutions.Preparation of super oleophobic surface in water phase.A rough micro-nano com-posite structure is constructed on the surface of the amorphous alloy by 4 V constant voltage electrochemical etching.The surface is hydrophilic in the air and exhibits super oleophobicity when placed in the water phase,and the oil droplets are in the Cassie model state.The surface has excellent durability in acid-alkaline solutions and sodium chloride solutions,and also has good wear resistance,can adapt to complex and harsh environments,and can be used as underwater self-cleaning,anti-oil and anti-corrosion.Preparation of ultra-hydrophobic surfaces with low adhesion in the air.By 20 V constant voltage electrochemical etching,an irregular leaf-like micron structure is con-structed on the surface of the amorphous alloy,on which are densely packed nano-scale fine particles.The surface can be super-hydrophobic after being modified by stearic acid,and the water droplets on the surface are in the Cassie model state,the rolling angle is less than 10°,and the sample surface has good self-cleaning performance.Stud-ies have shown that the surface has good durability in air and acidic solutions,but poor corrosion resistance in strong alkaline solutions and salt solutions,and its wear re-sistance is worse than that under low voltage.Preparation of Zr-based bulk amorphous alloy super-hydrophobic and highly ole-ophobic surface.Through 30 V constant voltage electrochemical etching,a micro-nano composite microscopic morphology is constructed on the surface of the amorphous al-loy,which is super-hydrophilic in the air,and the surface can be super-hydrophobic and highly oleophobic after being treated with stearic acid.The results show that the super-hydrophobic and highly oleophobic surface of the amorphous alloy has good self-clean-ing properties,durability,acid resistance and good wear resistance,but it has poor cor-rosion resistance in strong alkaline solutions and sodium chloride solutions. |
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