[The preliminary study on the oxide film of pure titanium treated by anodic oxidation].
OBJECTIVE
To study the oxide film of pure titanium implant material treated by anodic oxidation and to learn the effect of anodic oxidation on it.


METHODS
Six titanium sheets, which were ground, polished and pretreated, were treated by anodic oxidation at 10 v, 24 v or 40 v for 10 minutes and at 24 v for 10 minutes, 40 minutes or 2 hours. The microstructures and the corrosive-resistance of oxide films were studied by means of X-ray diffraction and electro-chemical corrosion.


RESULTS
The results of X-ray diffraction showed that the titanic peaks of 2.55 and 2.34 inverted as potential went up. Not many disorderly peaks of titanium oxide were found. And all the peaks of 2.55 and 2.34, 1.25 and 1.23, 1.72 and 1.47 did the same when time went on. Disorderly peaks of titanium oxide first appeared more and then fewer. The open loop potential of the oxide film treated by anodic oxidation moved positively, and polarized current was a 100'th of that of natural oxide film.


CONCLUSIONS
The oxide film with a certain color and crystallinity could be controlled by the potential and time. The corrosive-resistance of the oxide film is greatly improved by means of anodic oxidation. It will be the next study how to utilize and adjust the rule of titanium crystal corrosion.
Wang
G
G
Department of Prosthodonties, School of Stomatology, Wuhan University, Wuhan 430070, China.
Cheng
X
X
D015921:Dental Implants; D010084:Oxidation-Reduction; D014025:Titanium / Q000378:metabolism*
D015921:Dental Implants; D014025:Titanium