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Conductivity and Surface Electronic State of Resistive Passivation Oxide Films on Metals

金属上电阻钝化氧化膜的电导率和表面电子态

基本信息

批准号：
09650783
负责人：
OHTSUKA Toshiaki
金额：
$ 2.3万
依托单位：
HOKKAIDO UNIVERSITY (1998)Nagoya Institute of Technology (1997)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650783/
关键词：
Passivation Film Corrosion Resistivity Titanium ultra violet light Semiconductor Electrode Iron Ellipsometry Anode 光溶解

项目摘要

Surface electronic states of passivatlon oxide films on metals have been investigated for understanding the corrosion resistivity of the films. The resistivity of the passivation oxide films may be greatly connected with the energy position and density of the surface state. In this investigation, the change of the passivation films on titanium and iron was examined by ellipsometry and impedance during the ultra-violet (uv) light irradiation which may induces new surface states through the hole excitation.An ellipsometric measurement system has been developed In which the passivation oxide films on metals can be measured under uv light irradiation. By using the ellipsometer, the changes of the passivation films was measured with the simultaneous uv light Irradiation. The change of titanium passivation films depends on solution pH : Above pH 2, decrease of refractive index of the film and thickening of the film are observed. This observation means that the oxide film changes to a hydrous form. At an acidic solution of pH 1, same observation is Initially seen, however, the thinning of the film takes place during prolonged uv light irradiation. The hole generation by the uv light irradiation induces new electronic surface states and then hydration of the oxide. This reactions depend on solution pH values. From impedance measurement, it is seen that the electric capacitance changes with the uv light irradiation. The capacitance change corresponds to generation of the surface state on the film, hydration of the film, and light-Induced dissolution, For the passivation film on Iron, similar measurement was done. Although the film Is too thin to discuss the change of the passivation oxide films In detail, the hydration of the oxide films was observed with the uv light irradiation.

研究了金属上钝化氧化膜的表面电子态，以了解膜的耐腐蚀性。钝化氧化膜的电阻率可能与表面态的能量位置和密度有很大关系。在这项研究中，通过椭圆光度和阻抗检查了紫外（uv）光照射期间钛和铁上钝化膜的变化，这可能通过空穴激发诱发新的表面态。开发了一种椭圆光测量系统，可以在紫外光照射下测量金属上的钝化氧化膜。利用椭圆偏振仪，在紫外光照射下测量钝化膜的变化。钛钝化膜的变化取决于溶液的pH值：pH值高于2时，观察到膜的折射率降低和膜增厚。该观察结果意味着氧化膜变为水合形式。在 pH 1 的酸性溶液中，最初观察到相同的现象，但是，在长时间的紫外光照射下，膜会变薄。紫外光照射产生的空穴诱导新的电子表面态，然后导致氧化物水合。该反应取决于溶液的 pH 值。从阻抗测量可以看出，电容随着紫外光照射而变化。电容变化对应于膜上表面状态的产生、膜的水合和光诱导溶解。对于铁上的钝化膜，进行了类似的测量。虽然膜太薄，无法详细讨论钝化氧化膜的变化，但在紫外光照射下观察到氧化膜的水合情况。