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工艺需要开发钛合金，该合金具有出色的加工和耐腐蚀性。最近，通过硫化物或稀土元素的分散产生的自由体系合金。这项研究评估了通过电化学性质和牙齿施用自由耐钛合金的耐腐蚀性和细胞毒性。细胞增殖测试。在本实验中使用了Pure Titanium，Ti-3AL-2V合金和两种自由实力的钛合金（DT2F，DAT52F：DADODO钢）。使用电化学装置（PARC Potentiostat，具有软件软件M352C的273型）和存储在35℃恒温室中的腐蚀电池的电化学设备（PARC PotentioStat，273型号）测量了极化电阻和电力动力学极化谱。用纯氮气脱氧的0.9％NaCl和1.0％的乳酸溶液用作测试溶液。 SEM观察检查了电动测量后的斑点腐蚀的存在。使用L929 M…更多的尿液成纤维细胞，将5,000个细胞/ml的Eagle的MEM+10％FBS播种在金属上（直径13mm×1mm厚）24孔（16mm孔），并在37孔中孵育，并在37 co2中孵化。 3天和7天后，使用细胞对抗天然电极电位计数细胞数，并且自由结合的钛合金的极化耐药性低于钛和Ti-3Al-2V合金。从潜在的动力学极化行为中，所有钛合金均表现出相同的被动潜力（约为0.0 V与SCE），但是自由播放的钛合金表现出显着的高被动电流密度。所有合金的跨性电位几乎相同。在0.9％NaCl溶液中测试的游离钛合金表面上识别了凹坑。据彼此估计，自由体验的钛合金的耐腐蚀性不如纯钛和TI-3AL-2V合金。增殖的细胞数在3天时没有显着差异，而在7天的纯Ti（p <0.05）中，免费安装的钛合金的细胞增殖速率低于纯Ti的纯Ti（p <0.05）。较少的