The invention relates to a process for enhancing antibacterial activity of surfaces made of titanium alloy TiNbZrTa by growing oxide structures of nanotube type and decorating them with nanoparticles of CeOfixed on the nanotube surfaces by means of a bio-adhesive of polydopamine type, the application being meant to be used in the medical field for implantable materials and also in other fields in which the presence of the bacteria on surfaces is not wanted. According to the invention, the process consists in nanostructuring the alloy surface by electrochemical anodization in an electrolyte solution which comprises ethylene glycol, ammonium fluoride 0.5% and water 2%, at 40 V for 2 hours, followed by another anodization in phosphoric acid 0.9 M and hydrogen fluoride 0.5%, at 30V, for 2 hours, after which the polydopamine anchors are formed by immersion for 24 h in a solution of 0.078 M of dopamine in Tris buffer solution with pH 8.5 and Ce oxide nanoparticles are fixed by immersion in Tris buffer solution with pH 8.5 which comprises 0.25 mg/mL commercial powder of Ce oxide with the nanoparticle diameter ranging between 15...30 nm, wherefrom electro-chemically stable, uniform and adherent antibacterial films are obtained.
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