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

目前的牙科CAD/CAM工艺要求开发具有良好的加工性能和耐腐蚀性的钛合金。最近，易加工钛合金是通过分散一种硫化物或稀土元素来生产的。本研究通过电化学性能和细胞毒性评价牙科用易加工钛合金的耐腐蚀性和细胞毒性。细胞增殖实验：实验选用纯钛、Ti-3Al-2V合金和两种易加工钛合金(DT2F、DAT52F：Daido钢)。用电化学装置(PARC恒电位仪，273型，软件为M352C)和恒温箱中储存的腐蚀电池在35℃下测量了极化电阻和动电位极化曲线。以0.9%的氯化钠溶液和1.0%的纯氮气脱氧乳酸溶液作为试验溶液。扫描电子显微镜观察发现，电化学测量后存在点蚀。使用L929 m…取更多的尿成纤维细胞，5,000个/ml的Eagle‘s MEM+10%胎牛血清，接种于直径13 mm×1 mm的金属上24孔(直径16 mm)，37℃，5%CO2中培养。3天和7天后，用细胞计数法计数细胞数，易切削钛合金的自然电极电位和极化电阻低于钛合金和钛-3Al-2V合金。从动电位极化行为来看，所有钛合金都表现出相同的钝化电位(约0.0V vs SCE)，但易加工钛合金表现出显著的高钝化电流密度。所有合金的过钝化电位几乎相同。在0.9%的氯化钠溶液中，易加工钛合金表面出现了孔洞。结果表明，易加工钛合金的耐腐蚀性低于纯钛和Ti-3Al-2V合金，3天时增殖细胞数无明显差异，7天时细胞增殖率低于纯钛(P&lt；0.05)。较少