title: [Corrosion behavior of micro-arc oxidation film on titanium in simulated body fluid].
abstract: 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.
authors.affiliation: Department of Prosthodontics, The Affiliated Hospital of Medical College, Qingdao University, Qingdao Shandong 266003, China. laymanmail@163.com
authors.forename: Gui-lan
authors.initials: GL
authors.lastname: Sun
authors.forename: Jian-zhi
authors.initials: JZ
authors.lastname: Chen
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yu-long
authors.initials: YL
authors.lastname: Shi
mesh_terms: D003343:Corrosion; D017886:Durapatite / Q000138:chemical synthesis; D004563:Electrochemistry; D010084:Oxidation-Reduction; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D017886:Durapatite; D014025:Titanium