[Corrosion behavior of micro-arc oxidation film on titanium in simulated body fluid].
OBJECTIVE
To investigate the variation of 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 the titanium surface using micro-arc oxidation. The morphology was observed with scanning electron microscopy (SEM) and the phase composition was analyzed using X-ray diffraction (XRD). Polarization curves and electrochemical impedance spectroscopy (EIS) in simulated body fluid were examined with electrochemical methods.


RESULTS
On the titanium surface with micro-arc oxidation, the film consisted of many volcanic micropores. The film formed was a titanium dioxide (TiO(2)) with peaks for both anatase and rutile phases. In addition, hydroxylapatite was also observed. The self-corrosion potential and self-corrosion current density of titanium with micro-arc oxidation film were -0.255 V and 0.80 microA/cm(2) respectively, while those of untreated titanium were -0.358 V and 0.55 microA/cm(2). Electrochemical impedance spectroscopy confirmed the model of equivalent circuits reasonable.


CONCLUSIONS
The results of electrochemical examinations indicate that micro-arc oxidation film increases the corrosion resistance of titanium.
Sun
Gui-lan
GL
Department of Prosthodontics, The Affiliated Hospital of Medical College, Qingdao University, Qingdao Shandong 266003, China. laymanmail@163.com
Chen
Jian-zhi
JZ
Wang
Lei
L
Shi
Yu-long
YL
D003343:Corrosion; D017886:Durapatite / Q000138:chemical synthesis; D004563:Electrochemistry; D010084:Oxidation-Reduction; D014025:Titanium / Q000737:chemistry*
C009495:titanium dioxide; D017886:Durapatite; D014025:Titanium