新型钛铜合金的耐蚀性初探  

Corrosion resistance of Ti-Cu alloy

作　　者：宋育萱[1] 王世明[1] 

机构地区：[1]北京大学口腔医学院·口腔医院综合科,100081

出　　处：《中华口腔医学杂志》2010年第9期565-568,共4页Chinese Journal of Stomatology

摘　　要：目的 对新型钛铜合金进行耐蚀性评价,探讨其在口腔环境中应用的可能性.方法 分别制备Cu质量分数为5%和10%的钛铜合金（Ti-5Cu和Ti-10Cu）,用X射线衍射仪对钛铜合金进行物相分析,以纯钛、不锈钢（316L）作为对照,测量4种金属在0.9%NaCl溶液、添加1.0%乳酸的0.9%NaCl溶液中的开路电位和动电位极化曲线.结果 X射线衍射分析显示,两种钛铜合金主要由α相和Ti2Cu金属间化合物构成.在两种溶液中两种钛铜合金表现出类似的腐蚀行为.经3500 s浸泡,纯钛、Ti-5Cu、Ti-10Cu在0.9%NaCl溶液中的开路电位分别为-188、-181和-173 mV,在添加乳酸的0.9%NaCl溶液中的开路电位分别为-143、-158和-109 mV.动电位极化曲线显示,纯钛和Ti-5Cu在500 mV附近的维钝电流密度约为20 μA/cm2,而不锈钢出现明显的点蚀现象.结论 钛铜合金在0.9%NaCl溶液中表现出良好的耐蚀性,Ti-5Cu合金的耐蚀性与纯钛相当,Ti-10Cu合金的耐蚀性虽比纯钛有所降低,但仍大大优于不锈钢.乳酸的加入对钛铜合金的耐蚀性影响不大.Objective To investigate the corrosion behavior of Ti-Cu alloy in 0. 9% NaCl solution and in acidified 0. 9% NaCl solution. Methods The microstructure of Ti-Cu alloys were characterized by means of X-ray diffraction （XRD）. The electrochemical behavior of Ti-Cu alloy in two solutions （namely 0.9% NaCl solution and acidified 0. 9% NaCl solution） was tested. Commercial pure Ti and 316L stainless steel were used as control. Results Ti-Cu alloys were composed by a-Ti and Ti2Cu intermetallic compound. After 3500 s immersion, the open circuit potential（OCP） values of pure Ti, Ti-5Cu alloy and Ti-10Cu alloy in 0.9% NaCl solution were -188, -181 and -173 mV, respectively. In 0. 9% NaCl solution with lactic acid added, the OCP values were - 143, - 158 and - 109 mV, respectively. In potentiodynamic polarization tests, the passive current densities of pure Ti and Ti-5Cu alloys were about 20 μA/cm2. However, 316L stainless steel experienced pitting corrosion . Conclusions It was possible to establish the following relation for their corrosion resistances： pure Ti ≈ Ti-5Cu 〉Ti-10Cu 〉316L stainless steel. The addition of lactic acid in the solution did not compromise the corrosion resistance of Ti-Cu alloys.

关 键 词：钛 合金 电化学 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]