Table of Contents
Laser Chemistry
Volume 2009, Article ID 436065, 8 pages
http://dx.doi.org/10.1155/2009/436065
Research Article

Effect of Potential, Temperature, and Fluoride Ions on the Repassivation Kinetics of Titanium in Phosphate Buffered Saline Solution with the Photon Rupture Method

Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo, 060-8628, Japan

Received 15 February 2009; Revised 24 April 2009; Accepted 5 May 2009

Academic Editor: Margarita Martin

Copyright © 2009 Masatoshi Sakairi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of the applied potentials, temperature, and F ions on the localized repassivation kinetics of titanium was investigated by the photon rupture method, PRM, and electrochemical techniques in phosphate buffered saline solution. The logI versus logt plots after laser beam irradiation showed a rapid increase, then a decrease with a slope of about 1.5, which is steeper than that expected from high field oxide film formation theory, suggesting that the repassivation of titanium is a combination of electrochemical and chemical reactions. The repassivation current increases with increases in the applied potential and addition of F ions, while solution temperature does not influence the repassivation kinetics. The effect of F ions on the repassivation kinetics can be explained by localized pH changes caused by very rapid dissolution of titanium when titanium was exposed to PBS solution.