Utilize este identificador para referenciar este registo: http://hdl.handle.net/10284/3251
Título: Simultaneous degradation by corrosion and wear of titanium in artificial saliva containing fluorides
Autor: Souza, J.C.M
Barbosa, S. L
Ariza, E.
Celis, J-P.
Rocha, L. A.
Palavras-chave: Titanium
Fluorides
Wear
Corrosion
Tribocorrosion
Degradation
Data: 2012
Editora: Elsevier
Relatório da Série N.º: Wear;
Resumo: The degradation of titanium-based oral rehabilitation systems can occur by corrosion and wear processes taking place simultaneously (tribocorrosion) and influenced by the presence of fluorides. In this study, the tribocorrosion behavior of titanium in artificial saliva solutions containing fluorides is investigated. Before sliding tests were started up, electrochemical measurements such as open circuit potential (OCP) and impedance spectroscopy (EIS) were performed to get information on the corrosion behavior of titanium in artificial saliva solutions. Then, sliding wear tests were carried out at the OCP taken by the test sample. Scanning electron microscopy and weight loss measurements were performed after the tribocorrosion tests. The presence of a compact passive surface film on titanium immersed was demonstrated in artificial saliva free of fluorides and in presence of up to 227 ppm F-. However, a progressive degradation of titanium was observed at a F- concentration of 12,300 ppm. Additionally, the corrosion and wear resistance of the titanium oxide film formed at a F- concentration of 12,300 ppm differ from the ones obtained up to 227 ppm F- reflected by a decrease of the coefficient of friction although the material loss increased. The synergism between wear and corrosion processes on titanium needs thus to be further investigated to reach a reliable prediction of the long-term behavior of titanium-based prostheses and implants in the oral cavity.
Descrição: Article in press
Peer review: yes
URI: http://hdl.handle.net/10284/3251
ISSN: 0043-1648
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0043164812002050
Aparece nas colecções:FCS (DCM)- Artigos em Revistas Científicas Internacionais com Arbitragem Científica

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