Surface modification of NiTi alloy by sol-gel derived porous TiO_(2)film  

镍钛合金的溶胶-凝胶法多孔TiO_(2)薄膜表面改性

作　　者：付涛[1,2] 吴晓明[1] 吴锋[3] 罗孟[1] 董兵辉[1] 纪元[1] 

机构地区：[1]西安交通大学生命科学与技术学院,生物医学信息工程教育部重点实验室,西安710049 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004 [3]西安交通大学医学院,西安710061

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第7期1661-1666,共6页中国有色金属学报（英文版）

基　　金：Project(xjj2011096)supported by the Fundamental Research Fund for the Central Universities,China;Project(201107)supported by the Open Project Program of State Key Laboratory of Metastable Materials Science and Technology,China;Project(50901058)supported by the National Natural Science Foundation of China

摘　　要：Titania films with nano-sized pores were prepared on the NaOH？HCl pretreated NiTi alloy substrate by sol？gel method.A crack-free film is obtained for the sample with a dense inner layer and a porous outside layer（sample TC1＋1）.The X-ray diffraction shows that the titania films are composed of anatase,and a little Ni4Ti3 phase in the heat treated substrate is also detected.The X-ray photoelectron spectroscopy results indicate that the titania film completely covered the NiTi substrate for sample TC1＋1.The sample TC1＋1 is hydrophilic with a contact angle about 20°,and UV illumination treatment for 15 min further decreases the contact angle to（9.2±3.2）°.The potentiodynamic polarization test in 0.9% NaCl solution reveals a better corrosion resistance of sample TC1＋1 than the polished NiTi sample.在经过 NaOH-HCl 预处理的镍钛合金基体上,采用溶胶-凝胶法制备纳米多孔 TiO2薄膜;当涂覆一层致密内膜和一层多孔外膜时,可得到无裂纹的薄膜(试样 TC1+1)。X 射线衍射表明,TiO2薄膜由锐钛矿组成,在热处理的基体中还检测到少量的 Ni4Ti3相。X 射线光电子谱分析表明,试样 TC1+1 的 TiO2薄膜完全覆盖了镍钛合金基体。试样 TC1+1 的表面亲水,接触角约为 20°,紫外光照处理 15 min 后接触角降低到(9.2±3.2)°。在 0.9% NaCl溶液中的动电位极化实验表明,试样 TC1+1 的耐蚀性高于抛光的镍钛合金试样的。

关 键 词：NiTi alloy TITANIA sol-gel method HYDROPHILICITY corrosion resistance 

分 类 号：TG174.44[金属学及工艺—金属表面处理]