Corrosion behavior of TiO sub(2)-coated Ti-6Al-7Nb surfaces obtained by anodic oxidation in sulfuric or acetic acid

• Published in: Materials and corrosion Vol. 66; no. 7; pp. 635 - 642
• Main Authors: Cotolan, N, Pop, A, Marconi, D, Ponta, O, Muresan, L M
• Format: Journal Article
• Language: English
• Published: 01.07.2015
• Subjects: Acetic acid; Anodizing; Corrosion; Electrochemical impedance spectroscopy; Oxidation; Surgical implants; Titanium; Titanium dioxide
• ISSN: 0947-5117; 1521-4176
• DOI: 10.1002/maco.201407687

The morpho-structural and electrochemical properties of the oxide film formed on the implants surface play a decisive role for the bio-compatibility of titanium-based prosthesis. The aim of the present work is to investigate and compare the corrosion behavior of titanium dioxide (TiO sub(2)) coated Ti-6Al-7Nb prepared by anodic oxidation in two different electrolytes (1M acetic acid (CH sub(3)COOH) and sulfuric acid (H sub(2)SO sub(4)) solutions) and at two different oxidation potentials. The corrosion behavior of oxidized samples was investigated in Hank's simulated physiological solution, using cyclic polarization method and electrochemical impedance spectroscopy and the obtained results were compared with those recorded on bare Ti-6Al-7Nb in the same experimental conditions. The oxidation in CH sub(3)COOH was proven to be more beneficial for the corrosion resistance of Ti-6Al-7Nb samples than the oxidation in H sub(2)SO sub(4) of same concentration.