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 log I versus log t 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.
Highlights
Air formed oxide films or native oxide films on titanium and its alloys play a very important role in biocompatibility and corrosion resistance, the oxide films may be removed or destroyed mechanically or chemically during service
These results suggest that barrier type anodic oxide film formed on the specimen [27], and further, the constant current increase with the addition of F− ions suggests that F− ions accelerate the dissolution of titanium or formed oxide film
The photon rupture method was applied to investigate the effects of the applied potentials, temperature, and F− ions on the repassivation kinetics for commercial pure titanium in PBS, and the following conclusions may be drawn
Summary
Air formed oxide films or native oxide films on titanium and its alloys play a very important role in biocompatibility and corrosion resistance, the oxide films may be removed or destroyed mechanically or chemically during service. This oxide film breakdown may be a cause of further, continuous dissolution of the underlying metals, and as metals are dissolved in vitro, the increase in metal ion concentration may induce cell death near the dissolving metals. Handzlik and Fitzner [14] reported electronic properties of anodic oxide films formed on titanium in phosphate buffered saline solution and artificial saliva
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