Objective: To know the effects of electrolyte and voltage on the property of
anodic oxide films. Methods:In the test, titanium
plates were anodized at four different voltage (200V, 250V, 300V, 350V) and in six different electrolytic solution (β-glycerophosphate sodium:calcium acetate = 0.01M:0.15M, 0.02:0.20M, 0.03M:0.25M, 0.04M:0.25M, 0.05M:0.25M and 0.06M:0.30M ). Scanning electron microscopy was used to observe surface microstructure of titanium plates and EDAX was used to detect element content of plates'surface. Results:the extent of the plates'surface roughness tended to increase with increasing concentration of electrolyte and increasing electrolytic voltage, which made higher microprojections and bigger micropores on the titanium's surface. In addition, EDAX graph showed the ratio of Ca to Ti on the
anodic oxide films also increased with increasing concentration of electrolyte among the six groups of electrolytic solution which could form near-stoichiometric hydroxyapatite crystals. Conclusion:the composition and morphology of anodic oxide films were definitely influenced by electrolyte and electric voltage. When β-glycerophosphate sodium:calcium acetate was 0.04M:0.25M, ratio of Ca to Ti (3.6) was the most suitable to form both plentiful HA and stable oxide films. when Ca/P ratio was 1.8, the best
anodic oxidation condition was 300V direct electrolytic voltage.