CONICET | Buscador de Institutos y Recursos Humanos

Ti and its alloys present good biocompatibility making them suitablefor biomedical applications due to their low toxicity and their abilityto promote a positive osseous tissue response after surface modification.The development of a surface film by anodisation would decreasethe corrosion rate, minimising metal ion release to the biologicalmedia, and facilitating its osseointegration. The incorporationof Ca and P compounds on the anodised film is proposed as a way ofimproving the bioactivity of the metal implant. The aim of this workis to study the electrochemical properties and film structure of Tianodic oxides grown in phosphoric acid, followed by the electrodepositionof calcium and phosphorous compounds. The anodisation treatmentwas performed at a constant potential of 30 V with respect to acounter-eletrode during 1 h. During the electrodeposition a supersaturatedCaCl2 and NaH2PO4 solution was used, and the treatmentwas carried out at a constant current density of 3mA/cm2 for 45 min.The modified surfaces were characterised by Raman spectroscopyand SEM to identify the chemical species present and their crystallographicphases as well as the general morphology of the surface.Phosphate was detected on the anodised samples previous to electrodeposition,indicating its incorporation from the anodising solution.Hydrated calcium phosphate was also identified on the surfaceafter electrodeposition. Finally, electrochemical experiments wereconducted in order to study the corrosion resistance of the surfacemodified samples. The barrier effect is enhanced with the anodisingprocess and it is not further altered by the presence of the electrodepositedcompound.