TiN、TiCN涂层对牙科纯钛耐腐蚀性能的影响

Influence of TiN,TiCN coating on corrosion resistance of dental pure titanium

目的:在模拟口腔环境条件下,研究TiN、TiCN涂层对纯钛耐腐蚀性能的影响。方法:选用制作活动义齿常用的牙科纯钛材料,制作成10mm×l0mm×1mm规格的试件15个,随机分为A、B、C 3组。其中,B、C组采用电弧离子镀物理气相沉积技术,分别在其表面沉积一层厚为2.5μm的TiN、TiCN涂层。应用场发射环境扫描电子显微镜(FESEM)观察各组试样表面形貌并进行显微能谱分析;运用纳米压痕技术测试涂层的硬度和弹性模量;将3组试件分别置于人工唾液中,通过PARSTAT’2273电化学工作站进行极化曲线分析。采用SPSS 17.0软件包对数据进行t检验、单因素方差分析及非参数检验。结果:纳米压痕技术测试显示,B、C组的显微硬度及弹性模量均显著高于A组(P<0.001),而C组又显著高于B组(P<0.01)。电化学实验结果显示,3组试件的自腐蚀电位为A>B>C(P<0.05),自腐蚀电流为A<B、C(P<0.01),B、C组间无显著差异(P>0.05),三者的钝化膜击穿电位关系为A<B<C(P<0.05)。结论:2种涂层都能提高纯钛在人工唾液中的抗腐蚀性能,但相比之下,TiCN涂层的抗腐蚀效果优于TiN涂层。

PURPOSE： To investigate the effects of TiN and TiCN coating on corrosion resistance of pure titanium in the simulated oral environment.METHODS： The dental pure titanium commonly used in making removable denture was casted with 15 specimens,10mm×l0mm×1mm in size.The specimens were randomly divided into group A,group B and group C.In the group B and group C,the specimens were coated with a thickness of 2.5μm TiN and TiCN coating on surface by multi-arc physical vapor deposition,respectively.After microscopic energy spectrum analysis,microstructure and phase diffraction were examined by FESEM.Hardness and Young modulus of the various coating were determined by nanoindentation.The polarization curves of all specimens in artificial saliva were measured by PARSTAT＇2273 electrochemical station.The data were analyzed with SPSS 17.0 software package for t test,one-way ANOVA and nonparametric test.RESULTS： Both the microhardness and elastic modulus in the group B and group C were significantly superior to those in the group A（P〈0.001）.Meanwhile,both the microhardness and elastic modulus in the group C were significantly higher than those in the group B（P〈0.01）.Corrosion potential（Ecorr） was group A group B group C（P〈0.05）.However,corrosion current density（Icorr） was significantly lower in the group A than in the group B,and in the group A than in the group C（P〈0.01）,while not significantly different between the B and group C（P〈0.05）.Breakdown potential（Ebreak） was group Agoup Bgroup C（P〈0.05）.CONCLUSIONS： Both TiCN coating and TiN coating can improve corrosion resistance of pure titanium in artificial saliva.However,TiCN coating is superior to TiN coating in improving corrosion resistance of pure titanium.