[含氟口腔环境中氮化钛（TiN）涂层后镍铬合金的耐腐蚀性和耐磨性]

[Corrosion resistance and wear resistance of Ni-Cr alloy after coating titanium nitride (TiN) in oral containing fluorine environment].

作者信息

Weng Wei-Min, Yu Wei-Qiang, Shan Wei-Lan, Zhang Fu-Qiang

机构信息

Department of Prosthodontics,Ninth People's Hospital,College of Stomatology,Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai 200011, China.

出版信息

Shanghai Kou Qiang Yi Xue. 2010 Dec;19(6):621-5.

PMID:21431263

Abstract

PURPOSE

The aim of this study was to evaluate the corrosion resistance and wear resistance of Ni-Cr alloy after coating titanium nitride (TiN) in oral containing fluorine environment.

METHODS

Physical vapor deposition was established to coat titanium nitride (TiN) on the surface of dental cast Ni-Cr alloy to form TiN/Ni-Cr compound. Both Ni-Cr alloy and TiN/Ni-Cr compound were exposed to 37 degrees centigrade, artificial saliva containing 0.24% NaF. The polarization curves of the specimens were measured by PARSTAT 2273 electrochemical station to investigate its corrosion resistance. Vicker's hardness was measured by HXD-1000TMC/LCD micro-hardness tester to investigate its wear resistance. Statistical analysis was performed by SAS 8.2 software package for Student's t methods.

RESULTS

The corrosion potential of Ni-Cr alloy was -362.407 mV, the corrosion current density was 1.568μAcm(-2),the blunt-breaking potential was 426 mV bofor TiN coating. The corrosion potential of TiN/Ni-Cr compound was -268.638 mV, the corrosion current density was 0.114μAcm(-2),the blunt-breaking potential was 1142 mV after TiN coating. Polarization curves showed TiN/Ni-Cr compound improved the corrosion potential and blunt-breaking potential, decreased the corrosion current density. The Vicker's hardness of Ni-Cr alloy was 519.75±27.27 before TiN coating, the Vicker's hardness of TiN/Ni-Cr compound was 803.24±24.64, the D-value between them was 283.49±39.34. The difference of Vicker's harnesses between Ni-Cr alloy and TiN/Ni-Cr compound had significant (P<0.01).

CONCLUSION

The results demonstrate that the TiN coating can improve the corrosion resistant to F-and the surface hardness of Ni-Cr alloy. Supported by Research Fund of Science and Technology Commission of Shanghai Municipality (Grant No.08DZ2271100), Shanghai Leading Academic Discipline Project (Grant No.S30206 ) and Research Fund of Health Bureau of Shanghai Municipality (Grant No.2009074).

摘要

目的

本研究旨在评估在含氟口腔环境中氮化钛（TiN）涂层后镍铬合金的耐腐蚀性和耐磨性。

方法

采用物理气相沉积法在牙科铸造镍铬合金表面涂覆氮化钛（TiN），形成TiN/Ni-Cr复合材料。将镍铬合金和TiN/Ni-Cr复合材料置于37摄氏度、含0.24%NaF的人工唾液中。通过PARSTAT 2273电化学工作站测量试样的极化曲线，以研究其耐腐蚀性。用HXD-1000TMC/LCD显微硬度计测量维氏硬度，以研究其耐磨性。采用SAS 8.2软件包进行Student's t检验的统计分析。

结果

TiN涂层前，镍铬合金的腐蚀电位为-362.407 mV，腐蚀电流密度为1.568μAcm(-2)，致钝电位为426 mV。TiN涂层后，TiN/Ni-Cr复合材料的腐蚀电位为-268.638 mV，腐蚀电流密度为0.114μAcm(-2)，致钝电位为1142 mV。极化曲线表明，TiN/Ni-Cr复合材料提高了腐蚀电位和致钝电位，降低了腐蚀电流密度。TiN涂层前镍铬合金的维氏硬度为519.75±27.27，TiN/Ni-Cr复合材料的维氏硬度为803.24±24.64，两者之间的D值为283.49±39.34。镍铬合金与TiN/Ni-Cr复合材料的维氏硬度差异具有统计学意义（P<0.01）。