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Title:: Hydrothermal Synthesis of Strontium Titanate ?Bio-films on Ti6Al4V Alloy

Author(s):: SUN Jiamao; FU Tao; ZHANG Yaoren; School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China

Keywords:: Titanium alloy; Hydrothermal; Strontium titanate; Film; Osteoporosis; Corrosion; Adhesion

摘要:: 采用氢氧化钠和硝酸锶混合溶液对Ti6Al4V合金进行水热处理，温度180℃，时间1、3和6 h。X射线衍射、扫描电镜、电子能谱和X射线光电子能谱分析表明，水热处理后钛合金表面形成了钛酸锶的纳米颗粒薄膜，颗粒尺寸80~230 nm，薄膜中含有极少量铝和钒元素。在无钙Hank’s平衡盐液中的动电位极化和电化学阻抗实验表明，与抛光试样相比，水热处理3 h试样的耐蚀性大幅提高。显微硬度压入实验表明，钛酸锶薄膜具有良好的附着性和内聚力。水热处理制备钛酸锶薄膜的方法可用于钛合金Ti6Al4V骨科植入体的表面改性。

Abstract:: Ti6Al4V alloy was hydrothermally treated in the mixture solution of NaOH and Sr(NO3)2 at 180 ℃ for 1, 3 and 6 h. X-ray diffraction, scanning electron microscopy, energy dispersive of x-ray and x-ray photoelectron spectroscopy analyses showed that films consisting of SrTiO3 nanoparticles (size 80~230 nm) were formed on Ti6Al4V alloy after the hydrothermal treatments, and a small amount of Al and V existed in the films. Potentiodynamic polarization and electrochemical impedance spectroscopy tests in a Ca-free Hank’s balanced salt solution demonstrated that the hydrothermally treated sample (3 h) had much better corrosion resistance than the polished one. Micro-hardness indentation test showed that the SrTiO3 film had good adhesion and cohesion strength. The hydrothermal method to synthesize SrTiO3 films has the potential application in surface modification of Ti6Al4V orthopedic implants.