摘要
目的:比较类金刚石涂层(DLC)镍钛丝和未涂层镍钛丝在不同pH值和氟离子(F-)浓度的人工唾液中的耐腐蚀性能,为DLC在正畸治疗中的应用提供依据。方法:采用射频磁控溅射技术在镍钛丝上制备DLC,激光拉曼光谱(Raman)对镍钛丝进行表征;DLC镍钛丝作为实验组,未涂层镍钛丝作为对照组,2组镍钛丝分别浸泡在4组不同F-浓度和pH值的人工唾液中,即pH7+0%F-组、pH7+0.2%F-组、pH7+0.5%F-组和pH5+0.5%F-组。采用电化学工作站经典三电极体系绘制动电位极化(Tafel)曲线,并测定2组镍钛丝的自腐蚀电位(Ecorr)和腐蚀电流密度(Icorr);扫描电镜(SEM)观察2组镍钛丝经人工唾液腐蚀前后表面形态学。结果:Raman显示D峰和G峰,表明镍钛丝表面已镀有DLC。电化学腐蚀实验,与pH7+0%F-组比较,pH7+0.2%F-组DLC镍钛丝的Ecorr降低(P<0.05),Icorr升高(P<0.05);未涂层镍钛丝的Ecorr降低(P<0.05),Icorr升高,但差异无统计学意义(P>0.05)。与pH7+0.5%F-组比较,pH5+0.5%F-组DLC镍钛丝和未涂层镍钛丝的Ecorr降低(P<0.05),Icorr升高(P<0.05)。在同组人工唾液中,实验组镍钛丝的Ecorr均高于对照组(P<0.05),Icorr均低于对照组(P<0.05)。实验组和对照组镍钛丝的Tafel曲线随F-浓度增加和pH值降低依次向左偏移,提示耐腐蚀效果降低;SEM观察到腐蚀后镍钛丝表面有点状腐蚀,且对照组镍钛丝表面点状腐蚀多于实验组。结论:DLC镍钛丝耐腐蚀性较未涂层镍钛丝有所增强,但pH值降低和F-浓度增大均会降低其耐腐蚀性。
Objective：To compare the corrosion resistance abilities between diamond-like carbon（DLC）coated nickel-titanium arch（NiTi）wires and uncoated NiTi wires in the artificial saliva with different pH values and fluoride（F-）concentrations,and to provide the basis for the application of DLC in the orthodontics treatment.Methods：The DLC coated NiTi wires were prepared by radio-frequency magnetron sputtering technique.Raman spectrum was used to characterizate the NiTi wires.The DLC coated wires were taken as experiment group,and the uncoated NiTi wires were taken as control group,and the NiTi wires in two groups were exposed to four kinds of artificial saliva as four groups,pH7＋0%F-group：pH 7＋0.2% F-group,pH7＋0.5% F-group,and pH5＋0.5% F-group.The potentiodynamic polarization（Tafel）curves of NiTi wires in two groups were measured by the classic three electrode system of electrochemical workstation,and the corrosion potential（Ecorr）and the corrosion current density（Icorr）of the NiTi wires in two groups were detected;scanning electron microscope（SEM）was used to observe the morphology of the NiTi wires in two groups before and after corrosion with artificial saliva.Results：The Raman spectra results showed the typical D peak and G peak,which indicated that the NiTi wires had been coated by DLC.The electrochemical corrosion test showed that compared with pH7＋0% F-group,the Ecorr of DLC coated NiTi wires in pH7＋0.2% F-group was decreased（P〈0.05）and the Icorr was increased（P〈0.05）;the Ecorr of uncoated NiTi wires was decreased（P〈0.05）,and the Icorr was increased,but there was no significant difference（P〈0.05）.Compared with pH7＋0.5% F-group,the Ecorr of DLC coated NiTi wires and uncoated NiTi wires in pH5＋0.5% F-group were decreased（P〈0.05）and the Icorr were increased（P〈0.05）.Meanwhile,in the same group of artificial saliva,the Ecorr of NiTi wires in expiment group was apparently higher than that in control group（P〈0.05）and the Icorr was l
出处
《吉林大学学报（医学版）》
CAS
CSCD
北大核心
2016年第3期517-522,共6页
Journal of Jilin University：Medicine Edition
基金
吉林省科技厅科研基金资助课题(20150312021ZG)
关键词
类金刚石涂层
镍钛弓丝
人工唾液
电化学腐蚀
diamond-like carbon
Nickel-titanium arch wires
artificial saliva
electrochemical corrosion
