口腔含氟环境对钛表面氧化膜特性及其腐蚀行为的影响

Effects of oral fluoride-containing environment on titanium surface oxide film properties and its corrosion behaviors

目的研究口腔含氟环境对钛表面氧化膜特性及其腐蚀行为的影响。方法将纯钛试件浸泡于不同氟浓度的人工唾液中,以无氟人工唾液为对照组。收集浸泡7 d的试件与浸泡液,采用X射线光电子能谱(XPS)分析钛表面氧化膜组成;采用电化学阻抗谱(EIS)检测各组人工唾液中纯钛试件的腐蚀行为特征;采用电感耦合-等离子体发射光谱仪(ICP-OES)检测各组浸泡液中的钛离子释放量。结果 XPS广谱分析显示,钛表面的钛和氧元素含量随氟浓度的增加而逐渐降低,氟元素含量则相应增加; XPS高像素谱分析显示,钛表面的二氧化钛含量随氟浓度的增加而逐渐降低。EIS测试获得的奈奎斯特图(Nyquist)、波特相位图以及等效电路拟合数据显示,钛表面氧化膜的腐蚀阻抗随着氟浓度的增加而逐渐减小,钛腐蚀行为逐渐增强。ICP-OES检测发现,随着氟浓度的增加,钛离子释放量显著增加。结论口腔含氟环境能破坏钛表面氧化膜,加速钛腐蚀行为,进而引发钛离子释放,且该效应随氟浓度的增加而加剧。

Objective To study the effects of oral fluoride-containing environment on titanium surface oxide film properties and corrosion behaviors.Methods The pure titanium samples were immersed in artificial saliva with different fluorine concentrations,and the fluorine-free artificial saliva was used as the control group.The test samples and soaking solutions after 7 days were collected,and the titanium surface oxide film compositions were analyzed by X-ray photoelectron spectroscopy(XPS).Electrochemical impedance spectroscopy(EIS)was used to investigate the corrosion behaviors of pure titanium samples in artificial saliva of different groups.The quantities of titanium ion release in soaking solutions of different groups were detected by inductively coupled plasma optical emission spectrometer(ICP-OES).Results The analysis of XPS survey spectra showed that the contents of titanium and oxygen element on the titanium surface gradually decreased with the increase of fluorine concentration,whereas the content of fluorine element increased correspondingly.The analysis of XPS high resolution spectra showed that the content of TiO2 on the titanium surface decreased with the increase of fluorine concentration.According to the Nyquist plots,Bode-phase diagrams and equivalent circuit fitting data obtained by EIS test,the corrosion resistance of titanium oxide film decreased with the increase of fluorine concentration,and the corrosion behavior of titanium increased gradually.ICP-OES revealed a significant increase of titanium ion release as the concentration of fluoride increased.Conclusion The oral fluoride-containing environment can damage the titanium surface oxide film,accelerate the corrosion behavior,and in turn,induce the release of titanium ion.This effect is enhanced with the increase of fluorine concentration.