Anodic oxide films on titanium in acidic media

Abstract

The properties of thin (less than 10 nm) anodic oxide films formed on titanium have been investigated. Particular attention was paid in this study to the spontaneous open-circuit passive-active transition that the oxide films are known to undergo in acidic media. The mechanism leading to this breakdown was found to involve uniform dissolution of the film. The rate of the dissolution process was found to be proportional to the initial growth rate of the oxide film and to the open-circuit temperature. In addition the nature and concentration of both the cation and anion species in the open-circuit media were found to have a pronounced effect on the thinning rate of the anodic oxide films. 

Photocurrent spectroscopy and capacitance measurements were used to show that slowly formed oxide films are more crystalline than their rapidly grown counterparts. These techniques were also used to obtain the absorption coefficient spectrum, over the wavelength range 250 - 400 nm, for the titanium anodic oxide films. 

 Ellipsometry revealed that the anodic oxide films formed on titanium have a structure similar to the anatase form of TiO₂, and that a suboxide layer forms between the metal and the dioxide when the original growth field is reduced. (D72857/87)

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