Calcium Phosphate/Gelatin Composite Coatings on Titanium Surfaces by Electrochemical Depositon

Bioactive calcium phosphate(Ca-P) coated titanium is the most promising bone replacement materials. The pulsed electrochemical deposition method was employed to deposit CaP/gelatin composite coatings on titanium substrates.The main purpose of the study is to explore the optimum processing parameters of the composite coating. Electrolyte was made from the mixture of the Ca-P and gelatin aqueous solution with different concentrations.SEM, XRD and FTIR were used to characterize the composition and morphology of the coating.The coatings prepared under constant voltage and pulse voltage electrodeposition were compared and it was found that the pulse voltage mode was more suitable for preparing CaP/gelatin coatings.The optimized experimental conditions were as follows, pulse voltage range of 0 to-1.3V,the Ca~(2+) concentration of 5.0×10~(-4)mol/L;gelatin concentration of 0.5g/L,pH value of 5.0;temperature of 50℃.Osteoblasts were cultured on the coatings to evaluate the biocompatibility of coatings.Alamar Blue assay indicated that the composite coatings could favor the proliferation of the osteoblasts.