Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, USA.
J Mater Sci Mater Med. 2010 May;21(5):1413-20. doi: 10.1007/s10856-010-4001-0. Epub 2010 Feb 5.
The effect of various concentrations of povidone-iodine (PI) on the corrosion behavior of a commercially pure titanium alloy (Ti-1) has been investigated in normal saline solution to simulate the povidone-iodine addition in an oral environment. The open circuit potential, electrochemical impedance spectroscopy and potentiodynamic polarization measurements have been used to characterize the electrochemical phenomena occurring on the alloy surface. The open circuit potential values for Ti-1 in various concentrations of PI shift considerably towards noble direction as compared to pure normal saline. In the potentiodynamic polarization curve for Ti-1 in various solutions, the cathodic current density has increased for all concentrations of PI and the anodic current density has decreased. Only the 0.1% PI concentration is able to inhibit corrosion of Ti-1 in normal saline and the other higher concentrations studied, accelerate corrosion. The EIS data for Ti-1 in normal saline and in various concentrations of PI follows a one time constant circuit, suggesting the formation of a single passive film on Ti-1 which is not altered by the addition of PI to normal saline.
研究了不同浓度聚维酮碘（PI）在生理盐水中对商用纯钛合金（Ti-1）腐蚀行为的影响，以模拟口腔环境中聚维酮碘的添加。采用开路电位、电化学阻抗谱和动电位极化测量来表征合金表面发生的电化学现象。与纯生理盐水相比，Ti-1 在不同 PI 浓度下的开路电位值明显向贵金属方向移动。在各种溶液中 Ti-1 的动电位极化曲线中，所有 PI 浓度的阴极电流密度都增加，而阳极电流密度都降低。只有 0.1%PI 浓度能够抑制 Ti-1 在生理盐水中的腐蚀，而研究中其他较高浓度则加速腐蚀。Ti-1 在生理盐水和不同 PI 浓度下的 EIS 数据遵循一个时间常数电路，表明在 Ti-1 上形成了一层单一的钝化膜，PI 的添加不会改变该钝化膜。
