Calcium Phosphate÷Gelatin Composite Coatings on Titanium Surfaces by ElectrochemicalDepositon

Bioactive calcium phosphate (Ca―P)coated titanium is the most promising bone replacement materials. Bioactive calciumphosphate (Ca―P) coated titanium has the advantages of both metal and ceramicsand has been considered as one of the most promising bone replacementmaterials. Gelatin is the denatured form of collagen and is expected to bebeneficial for hard tissue applications. The CaP/gelatin composite coatings couldcombine the bioactivity and osteoconductivity of CaP with the good characteristicsof gelatin. In the present study, The pulsed electrochemicaldeposition method was employed to deposit CaP/gelatin composite coatings ontitanium substrates. The main purpose of the study is to explore the optimumprocessing parameters of the composite coating. Electrolyte was made from themixture of the Ca―P and gelatin aqueous solution with different concentrations.SEM, XRD and FTIR were usedto characterize the composition and morphology of the coating. The coatings prepared underconstant voltage and pulse voltage electrodeposition were compared and it was foundthat the pulse voltage mode was more suitable for preparing CaP/gelatincoatings. The results indicated that Theoptimized experimental conditions were as follows,:pulse voltage range, of 0 to ―1.3V, the Ca2+ concentrationof 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 biocompatibilityof coatings. Alamar Blue assay indicated that the composite coatings couldfavor the proliferation of the osteoblasts.