Evaluation of corrosion resistance of free-machining titanium alloy

易切削钛合金耐腐蚀性能评价

• 批准号: 11671949
• 负责人: ODA Yutaka
• 金额: $ 1.15万
• 依托单位: TOKYO DENTAL COLLEGE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11671949/
• 关键词: Titanium; Corrosion; electrochemical; Free machining; Titanium alloy

Current dental CAD/CAM process demands the development of titanium alloy which exhibits excellent machinability and corrosion resistance. Recently, free-machining titanium alloy produced by dispersion of a sulfide or rare earth elements. This study evaluated the corrosion resistance and cytotoxicity of free-machining titanium alloy for dental application through the electrochemical properties and. cell proliferation test.Pure titanium, Ti-3Al-2V alloy and two free-machining titanium alloys (DT2F, DAT52F : Daido steel) were used in this experiment. Polarization resistance and the potentiodynamic polarization profile were measured using an electrochemical device (PARC Potentiostat, Model 273 with soft-ware M352C) and a corrosion cell stored in a thermostatic chamber at 35℃. A 0.9% NaCl and a 1.0% lactic acid solution deaerated with pure nitrogen gas were used as a test solution. SEM observation examined presence of pitting corrosion following the electroche mical measurement.Using L929 m … More urine fibroblast, 5,000 cells/ml of Eagle's MEM+10% FBS were seeded on the metal (13mm diameter×1mm thick) in 24 well (16mm diameter) and incubated at 37℃ in 5% CO2. After 3 and 7days, the number of cells was counted using cell counterThe natural electrode potential and the polarization resistance of free-machining titanium alloys were lower than those of titanium and Ti-3Al-2V alloy. From the potentiodynamic polarization behavior, all titanium alloys showed same passive potential (around 0.0 V vs SCE), However free-machining titanium alloys showed remarkable high passive current density. The transpassive potential was nearly the same for all alloys. The pits were recognized on the surface of free-machining titanium alloy which was tested in the 0.9%NaCl solution. Accordingly, it was estimated that the corrosion resistance of free-machining titanium alloy was inferior to pure titanium and Ti-3Al-2V alloy.The proliferated cell number was not significantly different at 3 days, while the cell proliferation rate of free-machining titanium alloys was lower than that of pure Ti at 7 days (P<0.05). Less

当前的牙科 CAD/CAM 工艺要求开发具有优异切削加工性和耐腐蚀性的钛合金。最近，通过分散硫化物或稀土元素生产的易切削钛合金，评估了易切削钛合金的耐腐蚀性和细胞毒性。牙科应用钛合金通过了电化学性能和细胞增殖测试。纯钛、Ti-3Al-2V合金和两种易切削钛合金。 (DT2F、DAT52F：Daido 钢) 使用电化学装置（PARC 恒电位仪，型号 273，配有软件 M352C）和储存在 35 ℃恒温室中的腐蚀电池测量极化电阻和动电位极化曲线。使用经纯氮气脱气的0.9% NaCl和1.0%乳酸溶液作为测试溶液，检查是否存在。使用L929 m … More尿液成纤维细胞，将5,000个细胞/ml的Eagle's MEM+10% FBS接种到24孔（16mm直径）的金属（13mm直径×1mm厚）上，并在37℃下培养。 ℃在5%CO2中培养3天和7天后，使用细胞计数器计数细胞的自然电极电位和极化电阻。易切削钛合金的钝化电位低于钛和Ti-3Al-2V合金。从动电位极化行为来看，所有钛合金均表现出相同的钝化电位（相对于SCE约为0.0 V），但易切削钛合金表现出显着的高钝化电位。电流密度对于所有合金来说，在快削钛合金的表面上都发现了凹坑。据此，估计易切削钛合金的耐蚀性不如纯钛和Ti-3Al-2V合金。3天时增殖细胞数没有显着差异，而细胞增殖率则没有显着差异。易切削钛合金在 7 天时低于纯钛 (P<0.05)。