Study of the Vickers hardness and corrosion behavior of experimental Ti-Mo alloy in dental office bleaching agents

Abstract

At present, titanium and its alloys stand out for their mechanical and biological properties. Vickers hardness and the effect of 15%, 22% and 35% hydrogen peroxide (H2O2) on Ti-10Mo alloy corrosion were evaluated. A conventional double-walled glass cell was used for thermostatization. As reference electrode was used the Ag/AgCl (s)/KClsat and as auxiliary electrode graphite stick. The work electrodes consisted of Ti-10Mo cylinders embedded in polyethylene, with electrical contact by brass wire and silver paint on one end. The electrolyte used was H2O2 in concentrations of 15%, 22% and 35% and potentiodynamic measurements were recorded. The Vickers hardness was evaluated before the treatment using Vickers penetrator under load of 1000g and dwell time of 10s / measurement separately. The results showed an increase in the corrosion values in direct relation with the increase of the H2O2 concentration. At 35% concentration, at constant current of ~ 1.0V the alloy did not passivate, characterizing high corrosion rate. At the concentrations of 15% and 22% the results showed a tendency to pseudopassivation, with release of TiO2 and part of the product of the corrosion becoming semi-adherent to the surface of the working electrode and another part passing through the middle, characterizing intermediate corrosion velocity. It was concluded that higher H2O2concentrations produced higher electrochemical corrosion.Descriptors: Titanium; Alloys; Surface Properties; Corrosion; Tooth Bleaching Agents.

Evaluation of Microstructure and Mechanical Properties of a Ti10Mo8Nb Alloy for Biomedical Applications

“…For the XRD obtained for the analyzed ternary alloy, intense and major Ti-β peaks were identified. In addition, the crystallographic plane of this Ti-β-phase was also indexed to these minority peaks, which were stabilized with the increase in the amount of Mo and Nb in the nominal composition of the alloys [25]. It was also observed that the Ti-β peaks were shifted towards lower diffraction angles, as illustrated in Figure 5, suggesting that Mo and Nb atoms may have been dissolved in these crystalline structures.…”

“…Microhardness was evaluated in order to visualize material wear that has impact on prothetic development and aging of the material inside the body [25]. The Vickers microhardness test (HV) was carried out in accordance with ASTM E 384 using a microhardness tester (Shimadzu, Tamboré, Brazil).…”