Per: Gabriel Ribeiro Barbosa (instituto militar de engenharia), Francielly moura de souza soares (instituto militar de engenharia), Emília dos Santos Monteiro (instituto militar de engenharia ), cARLOS nELSON ELIAS (INSTITUTO MILITAR DE ENGENHARIA )
Abstract:
Titanium alloys are widely used for the manufacture of dental and orthopedic implants. Its use is owing to high corrosion resistance, biocompatibility and mechanical resistance. The most used alloy for implant is the Ti-6Al-4V alloy because it is an alloy with high mechanical strength. However, this alloy has elements such as Al and V that can cause deleterious health effects. Cp-Ti is widely used because it is fully biocompatible, but does not have adequate mechanical resistance for some applications. Studies have been looking for alloys that can supply the lack of fully biocompatible and high strength alloys, such as alloys containing elements as Ti, Nb, Ta and Zr. Corrosion resistance is another important parameter to measure the success of these alloys for biomedical use. In this work, corrosion tests were carried out using the potentiodynamic polarization technique of titanium grade 4 hard (TiG4), Ti-6Al-4V and Ti-30Nb-7Zr alloys. The microstructures of these alloys were characterized by optical microscopy. It was possible to observe by the corrosion test a similar behavior of the three alloys, in which the small difference in the current can be associated to the difference of their composition. It was observed β globular precipitates in the α-matrix of the Ti-6Al-4V alloy, a microstructure composed entirely of the α-phase with deformed grains in the TiG4 alloy and irregular α-phase precipitates in the β-matrix of the Ti-30Nb-7Zr alloy.