Research On The Construction Of Surface Micro-Nanostructures And Wettability Properties Of Titanium Alloy

Regulating the wettability of titanium alloy surfaces has significant implications for improving their corrosion resistance,antibacterial properties,self-cleaning abilities,and biocompatibility.Currently,the most effective approach to regulating the wettability of titanium alloy surfaces involves combining rough structural preparation with low surface energy modification.However,low surface energy modifiers are typically fluorinated organic compounds that are environmentally hazardous and have poor mechanical properties.Therefore,achieving good wettability on titanium alloy surface while avoiding toxicity and harm has high application value.Based on these existing practical problems,this project aims to use a composite treatment technique to prepare a titanium alloy surface with complex micro-nano concave/convex structures and good hydrophobicity,without using low surface energy modifiers and with a nontoxic,harmless and environmentally-friendly preparation process,and to study the growth mechanism of micro-nano structures in the composite treatment process.This article first explores the technique of electrochemical treatment of titanium alloys,preparing a hydrophobic surface on the surface of the titanium alloy using neutral sodium chloride electrolyte.Surface wettability,SEM,XRD,color-changing,surface roughness,and surface current density-time curves were analyzed in several aspects to study the growth mechanism of the surface micro-nano structures and the mechanism of wettability impact.Based on this,using the characteristics of the two phases of TC4 titanium alloy,the titanium alloy tissue under different temperature conditions was studied through heat treatment,adjusting the content and structure of the two phases of titanium alloy,followed by a composite treatment method by electrochemical treatment.The growth mechanism of surface micro-nano structures and the mechanism of wettability impact were studied by adjusting the three process parameters of heat treatment temperature,cooling method,and voltage.The research shows that without the use of low surface energy modifiers,and by using only electrochemical treatment,the surface water contact angle of the titanium alloy at a voltage of 65 V was 135°,with a roughness of 1.32 μm.By performing composite treatment at 980℃ for 0.5 h under air-cooled conditions and using a voltage of 45 V,multi-scale micro-nano structures were constructed on the surface of the titanium alloy.The maximum water contact angle on the surface increased to 148°,with a roughness of 2.90 μm.The surface microstructure of the titanium alloy composite treatment was rougher and more complex than that of electrochemical treatment alone.The composite treatment process is simple,does not use low surface energy modifiers,and the electrolyte is a neutral sodium chloride-glycerol-anhydrous ethanol aqueous solution with low cost,non-toxicity and environmental friendliness.In durability testing,the surface treated with the composite treatment method demonstrated good stability.