Effect of an amorphous titania nanotubes coating on the fatigue and corrosion behaviors of the biomedical Ti-6Al-4V and Ti-6Al-7Nb alloys

Autor(es)

Campanelli, Leonardo Contri ; Bortolan, Carolina Catanio ; Carvalho Pereira da Silva, Paulo Sergio ; Bolfarini, Claudemiro ; Camarinho Oliveira, Nilson Tadeu

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 65, p. 542-551, JAN 2017.
• Citações Web of Science: 14

Resumo

An array of self-organized TiO2 nanotubes with an amorphous structure was produced on the biomedical Ti-6Al-4V and Ti-6Al-7Nb alloys, and the resulting fatigue and corrosion behaviors were studied. The electrochemical response of the nanotubular oxide surfaces was investigated in Ringer physiological solution through potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The absence of transpassivation in the chloride-containing solution, in addition to the micron-scale values of the passivation current density, indicated the excellent corrosion behavior of the coating and the satisfactory protection against the creation of potential stress concentrators in the surface. Axial fatigue tests were performed in physiological solution on polished and coated conditions, with characterization of the treated surfaces by scanning electron microscopy before and after the tests. The surface modification was not deleterious to the fatigue response of both alloys mainly due to the nano-scale dimension of the nanotubes layer. An estimation based on fracture mechanics revealed that a circumferential crack in the range of 5 pm depth would be necessary to affect the fatigue performance, which is far from the thickness of the studied coating, although no cracks were actually observed in the oxide surfaces after the tests. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/11350-0 - Desenvolvimento de superfícies nanoestruturadas via eletroquímica em ligas biomédicas de titânio
• Beneficiário: Nilson Tadeu Camarinho de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 13/04423-3 - Comportamento em fadiga de ligas de titânio beta
• Beneficiário: Leonardo Contri Campanelli
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/01652-9 - Desenvolvimento de superfícies nanoestruturadas via eletroquímica em ligas biomédicas de titânio
• Beneficiário: Nilson Tadeu Camarinho de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores