Kuphasuk C, Oshida Y, Andres C J, Hovijitra S T, Barco M T, Brown D T
Department of Restorative Dentistry, School of Dentistry, Indiana University, Indianapolis, IN 46202-5186, USA.
J Prosthet Dent. 2001 Feb;85(2):195-202. doi: 10.1067/mpr.2001.113029.
Two varieties of unalloyed titanium, Ti-6Al-4V and NiTi, commonly are used in medical and dental fields. Several other types of alloys for potential use in these fields have been developed, including Ti-4.5Al-3V-2Mo-2Fe and vanadium-free alloys (Ti-5Al-2.5Fe and Ti-5Al-3Mo-4Zr). The corrosion of these alloys under simulated physiologic conditions is not known. Purpose. This study compared the corrosion behaviors of 6 titanium materials through electrochemical polarization tests in 37 degrees C Ringer's solution.
The applied voltage was potentiostatically scanned from -0.6 to 1.0 V. From polarization curves, the corrosion rate (averaged over 3 samples) for each alloy was calculated and compared with that of other alloys. Analysis of variance (ANOVA) and the Student-Newman-Keuls multiple range test were performed at a 95% overall confidence level to identify statistically significance differences in corrosion rates. Surface oxide films were identified by electron diffraction, and the electrolyte medium was analyzed by atomic absorption spectrophotometry after each alloy was tested.
Commercially pure titanium and Ti-5Al-2.5Fe were the most resistant to corrosion; Ti-5Al-3Mo-4Zr, Ti-6Al-4V, and NiTi were the least resistant to corrosion. NiTi exhibited pitting corrosion along with transpassivation.
Electron diffraction patterns indicated that all titanium alloys were covered mainly with rutile-type oxide (TiO(2)) after corrosion tests. The oxides that formed on Ti-5Al-2.5Fe were identified as a mixture of TiO(2) and Ti(9)O(17), and those that formed on NiTi were identified as a mixture of TiO(2) and Ni(2)Ti(4)O.
两种非合金钛，Ti-6Al-4V和镍钛合金，常用于医疗和牙科领域。已经开发出其他几种可能用于这些领域的合金类型，包括Ti-4.5Al-3V-2Mo-2Fe和无钒合金（Ti-5Al-2.5Fe和Ti-5Al-3Mo-4Zr）。这些合金在模拟生理条件下的腐蚀情况尚不清楚。目的。本研究通过在37℃林格氏溶液中进行电化学极化试验，比较了6种钛材料的腐蚀行为。
将施加电压从-0.6V恒电位扫描至1.0V。根据极化曲线，计算每种合金的腐蚀速率（3个样品的平均值），并与其他合金进行比较。在95%的总体置信水平下进行方差分析（ANOVA）和Student-Newman-Keuls多重范围检验，以确定腐蚀速率的统计学显著差异。通过电子衍射鉴定表面氧化膜，并在每种合金测试后用原子吸收分光光度法分析电解质介质。
商业纯钛和Ti-5Al-2.5Fe最耐腐蚀；Ti-5Al-3Mo-4Zr、Ti-6Al-4V和镍钛合金最不耐腐蚀。镍钛合金表现出点蚀和过钝化。
电子衍射图谱表明，所有钛合金在腐蚀试验后主要覆盖有金红石型氧化物（TiO₂）。在Ti-5Al-2.5Fe上形成的氧化物被鉴定为TiO₂和Ti₉O₁₇的混合物，在镍钛合金上形成的氧化物被鉴定为TiO₂和Ni₂Ti₄O的混合物。
