Estudo eletroquímico de ligas binárias experimentais de titânio em função de eletrólitos simulando condições normais da cavidade bucal e região periimplantar

• Autor(a) principal: Morais, Bruna Regina Gomes [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155231; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-04-25/000881180.pdf
• topic: Titânio; Zircônio; Corrosão; Osteogênese; Titanium

The objective of this research was to evaluate the in vitro corrosion behavior of experimental alloys Ti-Zr, with and without surface treatment, compared to commercially available alloys. For the electrochemical assay (n = 3) were made 48 Ticp discs, Ti-6Al-4V, Ti-5Zr, Ti-10Zr and Ti-15Zr, which were applied patterns as open circuit potential, electrochemical impedance spectroscopy (IEE) and potentiodynamic test, conducted in body fluid solution (SFC) and artificial saliva. The density of corrosion current (Icorr), passivation current density (IPASS), the corrosion potential (Ecorr), capacitance (Cdl) and polarization resistance (Rp) of the Ti oxide layer were determined. Electrochemical standards Icorr, IPass, and Rp Cdl showed better corrosion resistance of Ti-Zr tests when compared to conventional alloys. In the representation of data and electrochemical corrosion kinetics, the Ti-Zr alloys both as a function of saliva showed acceleration of the SFC oxide passivation film formed on the surface of the disks as well as lower total impedance. The surface topography for the conventional alloys, the texturing acid decreased the corrosion resistance (p<0,05), while the Ti-Zr alloys were similar in electrochemical patterns, independent of the topography (p>0,05). It can be concluded that the Ti-Zr alloys improved electrochemical behavior of Ti due to the artificial saliva and SBF and should be considered for medical and dental applications