Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Ellipso-Microscopic Observation of Titanium Surface under UV-Light Irradiation

  • Fushimi, K. (Faculty of Engineering, Hokkaido University) ;
  • Kurauchi, K. (Faculty of Engineering, Hokkaido University) ;
  • Nakanishi, T. (Faculty of Engineering, Hokkaido University) ;
  • Hasegawa, Y. (Faculty of Engineering, Hokkaido University) ;
  • Ueda, M. (Faculty of Engineering, Hokkaido University) ;
  • Ohtsuka, T. (Faculty of Engineering, Hokkaido University)
  • Received : 2016.09.22
  • Accepted : 2016.12.02
  • Published : 2016.12.31
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Abstract

The ellipso-microscopic observation of a titanium surface undergoing anodization in $0.05mol\;dm^{-3}$ of $H_2SO_4$ was conducted. During irradiation by ultra-violet (UV) light with a wavelength of 325 nm, the titanium surface allowed for the flow of a photo-induced current and showed up as a bright, patch-like image on an ellipso-microscopic view. The brightness and patch-pattern in the image changed with flowing photo-induced current. The changes in the brightness and the image corresponded to the formation and/or degradation of titanium oxide due to the photo-electrochemical reaction of the oxide. An in situ monitoring using the ellipso-microscope revealed that the film change was dependent on the irradiation light power, by UV-light increases the anodic current and results in the initiation of pitting at lower potentials as compared with the non-irradiated condition.

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References

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