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http://hdl.handle.net/10400.26/14741
Título: | Galvanic corrosion of two non noble dental alloys |
Autor: | Capelo, S. Proença, L. Fernandes, J. C. S. Fonseca, I. T. E. |
Palavras-chave: | Dental alloys Wiron®88 Remanium 2000+ Ions release Galvanic couples |
Data: | 2014 |
Editora: | ESG |
Citação: | Int. J. Electrochem. Sci., 9 (2014) 593 - 609 |
Resumo: | "This study aims to evaluate the corrosion resistance of two nonnoble dental alloys, namely, the Wiron®88 (Ni–Cr–Mo) and the Remanium 2000+ (Co–Cr–Mo–W). A noble alloy, the V-Gnathos® Plus (AuPt) previously studied was also considered for the purpose of comparison. The study was conducted in artificial saliva, pH 7.1, at 37 °C, by cyclic and linear sweep voltammetry, electrochemical impedance spectroscopy and chronoamperometry. The Rp value of the alloy of high contents of Ni, the Wiron®88, was 26.2±0.2 kΩ cm2 and of the one with high contents of Co, the Remanium 2000+, was 22.5±0.6 kΩ cm2. Data from linear polarization resistance and electrochemical impedance spectroscopy lead to the same order for the resistance against corrosion. The order from the less to the more reactive alloy is: Wiron®88 → Remanium 2000+. The galvanic cell obtained by coupling the two nonnoble alloys presents very low cell potential (a few mV, -18 mV), while the galvanic cell between one noble alloy (the V-Gnathos® Plus) and the Wiron®88 showed a higher cell potential (-104 mV). Both galvanic couples, under short circuit, have lead to the release of cations, namely, Co2+, in the case of the Wiron®88|Remanium 2000+ and Ni2+ for the Wiron®88|V-Gnathos® Plus, galvanic couples, respectively, with the ionic concentrations reaching values of 12.15 and 7.30 μg L-1 (7.30 ppb), respectively. SEM micrographs obtained after 25 days immersion in artificial saliva, at 37 °C, showed the formation of well-defined pits on the surface of the two non-noble alloys." |
Descrição: | Artigo licenciado sob uma Licença Creative Commons: https://creativecommons.org/licenses/by/4.0/ |
Peer review: | yes |
URI: | http://hdl.handle.net/10400.26/14741 |
ISSN: | 1452-3981 |
Versão do Editor: | http://www.electrochemsci.org/list14.htm#issue2 |
Aparece nas colecções: | EM - Artigos Científicos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Artigo02_LProença_2015.pdf | 584,12 kB | Adobe PDF | Ver/Abrir |
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