阳极氧化电压对β型Ti-12Mo-3Nb钛合金表面形貌和亲水性的影响  

Effect of anodic oxidation voltage on surface morphology and hydrophilicity ofβ-type Ti-12Mo-3Nb titanium alloy

作　　者：唐萍 江少群[1,2] 徐丽娟 王刚[1] TANG Ping;JIANG Shaoqun;XU Lijuan;WANG Gang(College of Mechanics and Materials, Hohai University, Nanjing 211100, China;Ocean and Offshore Engineering Research Institute of Hohai University, Nantong 226019, China;School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150006, China)

机构地区：[1]河海大学力学与材料学院,南京211100 [2]南通河海大学海洋与近海工程研究院,江苏南通226019 [3]哈尔滨工业大学材料科学与工程学院,哈尔滨150006

出　　处：《功能材料》2021年第2期2180-2184,2197,共6页Journal of Functional Materials

基　　金：南通市市级科技计划资助项目(JC2018113);中央高校基本科研业务费资助项目(2017B16114,B200205001)。

摘　　要：在医用钛合金表面制备TiO2纳米管阵列是提高其生物相容性的有效手段。以成本相对较低的新型β型生物钛合金Ti-12Mo-3Nb为对象,在含NH4F(0.5%)的丙三醇水溶液中,利用阳极氧化法在其表面制备TiO2基纳米管阵列,研究阳极氧化电压(20~50 V)对纳米管阵列形成过程、形貌以及亲水性的影响。结果表明,Ti-12Mo-3Nb合金表面存在分区氧化现象,分区氧化程度随氧化电压增大而增强;富含Mo、Nb元素区域TiO2基纳米管阵列呈“蜂巢状”,纳米管管径较小,且随氧化电压变化不明显;Mo、Nb含量较低区域的阵列生长方式主要有两种,即纳米管相互堆叠呈锥形塔状向下逐层生长或垂直试样表面有序生长,阵列具体形貌受纳米管形成速度、溶解速度以及F-在电场力作用下的扩散速度综合影响;25~50 V阳极氧化处理后Ti-12Mo-3Nb钛合金亲水性大幅度提升,合金表面微纳双结构有利于水的浸润,适当增大氧化电压会导致微纳结构增多,从而促进亲水性提升,经50 V阳极氧化3 h后合金接触角可低达14.5°左右。Preparing TiO2 nanotube array on the surface of medical titanium alloy is an effective method to improve its biocompatibility.In this paper,TiO2-based nanotube arrays were prepared on the surface of a new-type low-costβ-type bio-titanium alloy Ti-12Mo-3Nb by anodic oxidation in NH4F-contained glycerol aqueous solution(0.5wt.%).The effects of anodizing voltage(20V-50V)on the formation process,morphology and hydrophilicity of TiO2-based nanotube arrays were investigated.The results show that partition oxidation phenomenon exists on the surface of Ti-12Mo-3Nb alloy,and the extent of partition oxidation increases with the increase of oxidation voltage.The TiO2-based nanotube arrays which are existed in the area enriched in Mo and Nb element look like a"honeycombed";the diameters of the nanotubes are small and do not change significantly with the oxidation voltage.The TiO2-based nanotube arrays which are existed in the area not enriched in Mo and Nb element grow in two ways.One is stacked nanotubes growing layer by layer from top to bottom(like cone-shaped tower)and another is nanotubes growing perpendicularly to the surface of sample.The morphology of TiO2-based nanotube arrays is affected by the comprehensive effect of the formation and dissolution rate of nanotubes and the diffusion rate of F-under electric field.After 25-50V anodizing treatment,the hydrophilicity of Ti-12Mo-3Nb titanium alloy is greatly improved.The micro-nano composite structure on the alloy surface enhances hydrophilicity,and appropriate increasing of the oxidation voltage will increase the micro-nano composite structure.The contact angle of the Ti-12Mo-3Nb alloy anodized at 50V for 3h can be as low as about 14.5°.

关 键 词：Ti-12Mo-3Nb Β型钛合金 阳极氧化 TiO2基纳米管阵列 亲水性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]