Ti-Mo alloys: corrosion study in solutions simulating commercial gels

Abstract

Regarding to the influence of chloride and fluoride ions on the corrosion resistance, the electrochemical behavior of Ti alloys has been deeply studied. In this work, the main goal was to investigate the electrochemical behavior of cp-Ti and Ti-Mo alloys containing 6, 10 and 15 wt% of Mo concentrations. All the samples were immersed in different solutions, such as 0.15 mol L-1 Na2SO4, 0.15 mol L-1 Ringer, 0.15 mol L-1 Ringer plus 0.036 mol L-1 NaF and 0.036 mol L-1 NaF. Simulating the commercial fluorinated gels, the NaF solutions naturally-aerated were prepared with 1450 ppm of fluoride ions. The electrochemical techniques applied in this work were the open-circuit potential, cyclic voltammetry, besides the technique for chemical identification, which was X-ray photoelectron spectroscopy. The formation and growth of TiO2 and MoO2 were identified, without pitting corrosion. The electrochemical stability and the corrosion resistance of the Ti-Mo alloys decreased in the solutions containing chloride and fluoride ions, with an appreciative decrease especially in the fluorinated medium. The Ti-Mo alloy with higher Mo content concentration was the material with higher corrosion resistance. Therefore, it is a promising candidate as a biomaterial, once the osseointegration needs a satisfactory corrosion resistance for being achieved.

Corrosion characterization of the experimental alloy Ti-35Nb-7Zr-5Ta by electrochemical techniques

“…The electrochemical experiments were conducted in accordance with the provisions of the literature. (De Assis et al, 2006;Rodrigues et al, 2015;Varella Rodrigues & Carlos Guastaldi, 2018) In a standard cell of three electrodes with an exposed area of 0.8 cm 2 of working electrode, with a platinum mesh as a counter electrode and silver / silver chloride (Ag / AgClsat) as the reference electrode. These studies were carried out in a 0.9% NaCl solution, at room temperature, in media and…”