Abstract
The purpose of this study was to investigate hydroxyapatite coatings on micropore-formed titanium alloy, utilizing an electrochemical deposition method. A commercially pure titanium surface was used as a substrate for calcium phosphate (CaP) deposition on micropores formed after anodization. Prepared surfaces were anodized in 1M H3PO4 solution, and CaP deposition was performed with a potentiostat at cathodic potential in an electrolyte containing 0.042M Ca(NO3)2 and 0.025M NH4H2PO4. Micropores acted as growth sites for nanophase CaP crystals. Flake-like CaP and needle-like CaP were observed at 25°C and 85°C, respectively. If the specimen was not heat-treated, octacalcium phosphate and hydroxyapatite were observed, whereas slight CaP decomposition to tricalcium phosphate occurred with heat treatment at 700°C. The phenomena involved in CaP deposition were affected by the electrolyte temperature for both morphology and nucleation site.
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