3种整铸支架义齿常用金属的耐腐蚀性比较  

Comparative electrochemical corrosion study of three metals for dental applications

作　　者：李惠玲 杜华丽[2] 高明英[2] 陈婵娟 林映荷[2] 

机构地区：[1]珠海市第二人民医院口腔科,珠海519020 [2]四川大学华西口腔医院修复科,成都610041

出　　处：《华西口腔医学杂志》2011年第5期481-484,共4页West China Journal of Stomatology

摘　　要：目的以电化学方法比较3种整铸支架活动义齿常用金属试件的耐腐蚀性。方法将钴铬合金、含钛镍铬合金、纯钛3种试件置于pH为6.8的人工唾液中,通过电化学线性扫描技术获得Tafel曲线,比较腐蚀电位、腐蚀电流;通过X射线衍射(XRD)仪观测腐蚀前后试件的表面物相结构;以场发射扫描电镜观察金属表面形貌的改变和差异。结果含钛镍铬、钴铬合金记录到典型的Tafel曲线,而纯钛未能获得。含钛镍铬合金的腐蚀电位值明显负于钴铬合金,腐蚀电流更大(P<0.05)。XRD结果:三者的腐蚀前后衍射图皆一致,没有物质结构改变。扫描电镜显示:腐蚀前后,含钛镍铬和钴铬合金表面形貌均有极大的差异,含钛镍铬合金腐蚀前后形貌差异明显较后者大;纯钛没有腐蚀表现。结论含钛镍铬合金的腐蚀倾向最大,钴铬合金较小,纯钛最稳定。Objective The aim of this study was to investigate the korrosionsneigung of three metal specimens for casing removable denture by means of electrochemical method.Methods Three kinds of test specimens were prepared,including cobalt-chromium alloy,nickel-chrome alloy with titanium and pure titanium.Then they were analyzed via linear polarization in artificial saliva simulating oral environment.From this electrochemical test the polarization curves of these kinds of specimens were recorded.Then the scanning electron microscope（SEM） and X-ray diffractometer（XRD） were applied to assess the morphology and phase changes before and after electrochemical corrosion.Results No typical Tafel curve had been recorded for pure titanium,other than cobalt-chromium alloy and nickel-chrome alloy with titanium.Nickel-chrome alloy with titanium got more negative corrosion potential and higher corrosion current than cobalt-chromium alloy.Via SEM,the obvious changes were observed on the morphology and phase before and after corrosion on cobalt-chromium and nickel-chrome alloy with titanium specimens while pure titanium having no change.The XRD provided us little changes on these all three materials.Conclusion The results confirm that the korrosions-neigung of the studied cobalt-chromium alloy in artificial saliva is lower than that nickel-chrome alloy with titanium.Pure titanium is the most stable one of the three materials and is extreme hard to be etched.

关 键 词：金属 腐蚀 人工唾液 

分 类 号：R783.1[医药卫生—口腔医学]