[Corrosion behavior of titanium with micro-arc oxidation in simulated body fluid].
OBJECTIVE
To examine the corrosion resistance of micro-arc oxidation film on titanium by electrochemical methods in simulated body fluid.


METHODS
Micro-arc oxidation film was formed on titanium surface by using micro-arc oxidation. The morphology, phase composition and the surface roughness were observed by scanning electron microscopy (SEM), X-ray diffraction(XRD) and profilemeter, respectively. Polarization curves in simulated body fluid was examined by electrochemical methods. SPSS11.0 software package was used for one-way ANOVA.


RESULTS
On titanium surface with micro-arc oxidation, the film was consisted of many volcanic microporous, about 0.1microm -5microm in diameter. The film formed was a titanium oxide (TiO(2)) with peaks for both anatase and rutile phases, in addition, hydroxylapatite was also observed. Roughness increased on titanium surface. The self-corrosion potential and self-corrosion current density of titanium with micro-arc oxidation film were -0.255V and 0.80microA/cm(2) respectively, while those of untreated titanium were -0.358V and 0.55microA/cm(2).


CONCLUSIONS
The results of electrochemical examinations indicate that micro-arc oxidation film increases the corrosion resistance of titanium.
Department of Prosthodontics, The Affiliated Hospital of Qingdao University Medical College, Qingdao 266003, Shandong Province, China. laymanmail@163.com
Gui-lan
GL
Sun
Lei
L
Wang
D001826:Body Fluids; D003343:Corrosion; D003764:Dental Materials; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D014025:Titanium
D003764:Dental Materials; C009495:titanium dioxide; D014025:Titanium