3303 Electrochemical deposition of calcium phosphate thin film on titanium substrate

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Electrochemical depositions of calcium phosphate thin film on commercial pure titanium and Ti-6Al-4V in an electrolyte, monocalcium phosphate monohydrate (MCPM) based aqueous solution, was carried out by the cathodic reaction. The substrates were etched in 20% by volume of HF for 10sec before electrolytic deposition process. The calcium phosphate thin film could be formed in negative regions at 3 to 5mA/cm^2. The film thickness was varied depend on its deposition time and current density. In addition, the uniformity of film depended on current density. The major phase appeared in the film were brushite co-existed with amorphous calcium phosphate (ACP). The Ca/P ratio from EDS analysis were 1.16, 1.38 for brushite and ACP. After soaking in revised-simulated body fluid (r-SBF) for 24h, the amorphous bone-like apatite (major phase) existed with β-TCP (minor phase). The Ca/P ratio of bone-like apatite was 1.67 which was equal to those of human bone.
2006-09-15