TiN涂层对牙科NiCr合金耐蚀性能的影响  

Effect of TiN coating on corrosion resistance of dental NiCr alloy

作　　者：胡滨[1] 陈洁[1] 

机构地区：[1]上海交通大学医学院附属第九人民医院·口腔医学院口腔修复科,上海市口腔医学重点实验室,上海200011

出　　处：《上海口腔医学》2009年第1期73-76,共4页Shanghai Journal of Stomatology

摘　　要：目的:在模拟口腔环境中,研究氮化钛(TiN)涂层对镍铬(NiCr)合金耐腐蚀性能的影响。方法:选用烤瓷内冠常用的NiCr合金,制作成10mm×10mm×3mm规格的试件,采用电弧离子镀物理气相沉积技术,在其表面沉积一层厚为2.5μm的TiN涂层。将涂层前、后的试件分别置于人工唾液中,通过电化学工作站进行塔菲尔极化曲线分析。结果:塔菲尔极化曲线图形可见,NiCr合金表面TiN涂层后,表现出阳极和阴极极化曲线低平,自腐蚀电位向正方向移动,维钝电流降低,钝化区间变大。自腐蚀电位从-0.2487V上升至-0.0685V,自腐蚀电流密度从0.2628μA.cm-2下降至0.1895μA.cm-2,破钝电位从0.8505V上升至1.2566V。结论:TiN涂层可提高NiCr合金的耐腐蚀性能。PURPOSE： To investigate the effect of titanium nitride coating on corrosion resistance of NiCr alloy in the simulate oral environment. METHODS： The NiCr alloy commonly used for porcelain crown was east with specimen size of 10mm×10mm×3mm. Then the specimen was coated with a thickness of 2.5μm titanium nitride coating on the surface by multi-arc physical vapor deposition. The Tafel polarization curves of the specimen before and after coating titanium nitride in artificial saliva were measured by electrochemical station. RESULTS： From the Tafel polarization curves, the specimen after coating titanium nitride showed that both anodic polarization curve and cathodal polarization curve were flat, and gained the higher natural corrosion potential, lower passivation maintaining current, longer passivation interval. The natural corrosion potential increased from -0.2487V to -0.0685V. The natural corrosion current density decreased from 0.2628μA·cm^-2to 0.1895μA·cm^-2. The rupture potential increased from 0.8505V to 1.2566V. CONCLUSION： Titanium nitride coating can improve corrosion resistance of NiCr alloy.

关 键 词：TIN涂层 NiCr合金 极化曲线 耐蚀性能 

分 类 号：R783.1[医药卫生—口腔医学]