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首页> 外文期刊>Biomaterials >Passive film on orthopaedic TiAlV alloy formed in physiological solution investigated by X-ray photoelectron spectroscopy.
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Passive film on orthopaedic TiAlV alloy formed in physiological solution investigated by X-ray photoelectron spectroscopy.

机译：通过X射线光电子能谱研究了在生理溶液中形成的整形外科TiAlV合金上的钝化膜。

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摘要

The passive film formed by electrochemical oxidation on TiAlV alloy in physiological solution was studied using X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The alloy was polarised at different oxidation potentials in the electrochemical chamber attached to the spectrometer. Thus the composition of the layer formed by oxidation was analysed by XPS without prior exposure to air (quasi-in situ). The oxide layer was predominantly TiO2, which contained a small amount of suboxides TiO and Ti2O3 closer to the inner metal/oxide interface. With increasing potential the content of Ti4+ species increased and that of Ti3+ and Ti2+ decreased. The content of titanium in TiO2 was lower than theoretically predicted due to the incorporation of Al2O3 in TiO2 matrix. Vanadium oxide was not identified by XPS. Angular resolved XPS analysis confirmed that Al2O3 is located mainly at the outer oxide/solution interface. The thickness of the oxide layer was dependent on the oxidation potential and after oxidation at 2.5 V reached 9 nm. EIS measurements were used to in situ characterise electronic properties of passive films over seven decades of frequency. A link between electronic, electrochemical and physiochemical properties was established.
机译：利用X射线光电子能谱（XPS）和电化学阻抗谱（EIS）研究了在生理溶液中TiAlV合金上电化学氧化形成的钝化膜。合金在连接到光谱仪的电化学室中以不同的氧化电位极化。因此，在不事先暴露于空气（准原位）的情况下，通过XPS分析了由氧化形成的层的组成。氧化物层主要为TiO2，其中包含更靠近内部金属/氧化物界面的少量亚氧化物TiO和Ti2O3。随着电位的增加，Ti4 +种类的含量增加，而Ti3 +和Ti2 +的含量减少。由于在TiO2基体中引入了Al2O3，因此TiO2中的钛含量低于理论上的预期。 XPS未鉴定氧化钒。角度解析XPS分析证实Al2O3主要位于外部氧化物/溶液界面。氧化物层的厚度取决于氧化电位，并且在2.5V下氧化后达到9nm。 EIS测量被用来原位表征超过70个频率的无源薄膜的电子性能。在电子，电化学和物理化学性质之间建立了联系。

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