Titanium Surface Anodized under UV-light Irradiation Observed by Ellipso-microscopy
Titanium Surface Anodized under UV-light Irradiation Observed by Ellipso-microscopy
复制标题
椭圆显微镜观察紫外光照射下钛表面阳极氧化
DOI：
10.1007/s10008-015-2753-7
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Ohtsuka
中科院分区：
文献类型：
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作者：
K. Fushimi;K. Kurauchi;H. Ikeyama;Y. Kitagawa;T. Nakanishi;Y. Hasegawa;M. Ueda;T. Ohtsuka
通过使用原位电化学椭圆显微镜研究了阳极化钛表面在0.05 mol dm− 3硫酸溶液中的光腐蚀。在恒电位极化下，紫外光（UV）照射在阳极氧化表面上，由于氧化膜的不均匀生长，在椭圆显微镜下显示出斑块状的明亮图像，允许光致阳极电流的流动，并改变图像中的亮度和斑块图案。这表明照射促进光电化学反应，导致表面上的氧化物膜的厚度和/或结构的变化。薄膜的变化不仅取决于辐照光的功率密度，而且还取决于辐照过程中施加的电势和衬底的结晶取向。点蚀引发过程中的动电位极化在酸与溴离子也监测使用椭圆显微镜。辐照导致点蚀起始电位低于非辐照条件下的电位。
Photo-corrosion of an anodized titanium surface in 0.05 mol dm−3sulfuric acid solution was investigated by using an in situ electrochemical ellipso-microscope. Irradiation of ultra-violet (UV) light on an anodized surface, which showed a patch-like bright image on an ellipso-microscopic view due to non-uniform growth of the oxide film, under potentiostatic polarization allowed the flow of a photo-induced anodic current and changed the brightness and patch pattern in the image. This indicates that the irradiation promotes photo-electrochemical reaction, resulting in a change in the thickness and/or structure of the oxide film on the surface. The film change was dependent not only on power density of the irradiation light but also on applied potential during the irradiation and crystallographic orientation of the substrate. Pitting initiation during potentiodynamic polarization in the acid with bromide ions was also monitored using the ellipso-microscope. The irradiation resulted in pitting initiation at lower potentials than those in a non-irradiated condition.