类金刚石涂层与未涂层镍钛丝在人工唾液中耐腐蚀性能的比较

发布时间：2018-06-15 08:14

本文选题：类金刚石涂层 + 镍钛弓丝　；参考：《吉林大学学报(医学版)》2016年03期

【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(P0.05),Icorr升高(P0.05);未涂层镍钛丝的Ecorr降低(P0.05),Icorr升高,但差异无统计学意义(P0.05)。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(P0.05),Icorr升高(P0.05)。在同组人工唾液中,实验组镍钛丝的Ecorr均高于对照组(P0.05),Icorr均低于对照组(P0.05)。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。
[Abstract]:Objective: to compare the corrosion resistance of diamond-like carbon (DLC) nickel titanium wire and uncoated nickel titanium wire in artificial saliva with different pH value and F-F concentration in order to provide evidence for the application of DLC in orthodontic treatment. Methods: DLCs were prepared on Ni-Ti wire by RF magnetron sputtering technique. Laser Raman spectroscopy (Ram) was used to characterize the Ni-Ti wire as experimental group. The uncoated nickel-titanium wire was soaked in artificial saliva of different F- concentration and pH value in 4 groups, namely pH 7.0 F- group and pH 7 0.2% F- group, pH 7 0.5 F- group and pH5 0.5 F- group respectively. The electrochemistry workstation system was used to draw the Tafel curve of electrokinetic polarization, and the self-corrosion potential Ecorr and the corrosion current density of the two groups of nickel titanium wire were measured, and the surface morphology of the two groups of nickel titanium wire before and after the corrosion of artificial saliva was observed by scanning electron microscope (SEM). Results the D and G peaks of the Ni Ti wire were shown by the W Raman spectra, indicating that there was DLC on the surface of the Ni Ti wire. In the electrochemical corrosion test, compared with the pH 7.0 F- group, the Ecorr of the DLC nickel titanium wire in the pH 7.0 / F- group decreased P0.05% and that of the uncoated Ni-Ti wire increased P0.05, but there was no significant difference between the two groups, but there was no significant difference between the two groups. Compared with the pH 7.5% F- group, the Ecorr of DLC Ni-Ti wire and uncoated Ni-Ti wire in pH5 0.5 F- group decreased P0.05 and Icorr increased. In the artificial saliva of the same group, the Ecorr of Ni-Ti wire in the experimental group was higher than that in the control group (P 0.05) and Icorr was lower than that in the control group (P 0.05). The Tafel curve of Ni-Ti wire in the experimental group and control group shifted to the left with the increase of F- concentration and the decrease of pH value, indicating that the corrosion resistance was reduced and the surface of Ni-Ti wire was observed to be punctate corrosion after corrosion by SEM. The surface corrosion of nickel titanium wire in the control group was more than that in the experimental group. Conclusion the corrosion resistance of% DLC Ni-Ti wire is better than that of uncoated Ni-Ti wire, but the decrease of pH value and the increase of F- concentration will decrease its corrosion resistance.
【作者单位】：吉林大学口腔医学院正畸科;吉林大学超硬材料国家重点实验室;
【基金】：吉林省科技厅科研基金资助课题(20150312021ZG)
【分类号】：R783.5

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