CONICET | Buscador de Institutos y Recursos Humanos

Ti and its alloys present good biocompatibility making them suitable for biomedical applications due to their low toxicity and their ability to promote a positive osseous tissue response after surface modification. The development of a surface film by anodisation would decrease the corrosion rate, minimising metal ion release to the biological media, and facilitating its osseointegration. The incorporation of Ca and P compounds on the anodised film is proposed as a way of improving the bioactivity of the metal implant. The aim of this work is to study the electrochemical properties and film structure of Ti anodic oxides grown in phosphoric acid, followed by the electrodeposition of calcium and phosphorous compounds. The anodisation treatment was performed at a constant potential of 30 V with respect to a counter-eletrode during 1 h. During the electrodeposition a supersaturated CaCl2 and NaH2PO4 solution was used, and the treatment was carried out at a constant current density of 3mA/cm2 for 45 min. The modified surfaces were characterised by Raman spectroscopy and SEM to identify the chemical species present and their crystallographic phases 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 surface after electrodeposition. Finally, electrochemical experiments were conducted in order to study the corrosion resistance of the surface modified samples. The barrier effect is enhanced with the anodising process and it is not further altered by the presence of the electrodeposited compound.

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