Resistência à corrosão das fases presentes em amálgamas dentários
Article Sidebar
Main Article Content
Abstract
Neste trabalho avaliou-se a resistência à corrosão em solução salina das fases presentes na microestrutura de amálgamas dentários comerciais: g1-Ag2Hg3, o eutético Ag-Cu e g2-Sn7-8Hg, empregando-se técnicas eletroquímicas de potencial a circuito aberto com o tempo, de polarização potenciodinâmica e de espectroscopia de impedância eletroquímica. As ligas metálicas em estudo já foram caracterizadas em um trabalho prévio, por meio de microscopia eletrônica de varredura e difratometria de raios X. A resistência à corrosão se origina da formação de filmes passivos na superfície metálica e parece estar determinada pela natureza rugosa e porosa das superfícies.
Metrics
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
The corresponding author transfers the copyright of the submitted manuscript and all its versions to Eclet. Quim., after having the consent of all authors, which ceases if the manuscript is rejected or withdrawn during the review process.
When a published manuscript in EQJ is also published in other journal, it will be immediately withdrawn from EQ and the authors informed of the Editor decision.
Self-archive to institutional, thematic repositories or personal webpage is permitted just after publication. The articles published by Eclet. Quim. are licensed under the Creative Commons Attribution 4.0 International License.
References
Acciari, H. A.; Codaro, E. N.; Guastaldi, A. C. A comparative study of the corrosion of high copper dental amalgams. Mat. Lett., v. 36, p.148-51, 1998. [ Links ]
Acciari, H. A.; Guastaldi, A. C.; Brett, C. M. A. Corrosion of dental amalgams: electrochemical study of Ag-Hg, Ag-Sn and Sn-Hg phases. Electrochim Acta. In Press. [ Links ]
Acciari, H. A.; Rocha-Sousa, L.; Guastaldi, A. C. Parte I: amálgamas dentários – caracterização microestrutural de suas fases constituintes. Ciência & Tecnologia dos Materiais - Revista Sociedade Portuguesa Materiais, v. 11, p.13-9, 1999. [ Links ]
ADA COUNCIL ON SCIENTIFIC AFFAIRS Dental amalgam: updat on safety concerns. J. Amer. Dent. Assoc., v.129, p.494-503, 1998. [ Links ]
Asanuma, M.; Aogaki, R. Morphological pattern formation in pitting corrosion. J. Electroanal. Chem., v. 396, p.241-9, 1995. [ Links ]
Brett, C. M. A., Oliveira Brett, A. M. Electrochemistry. Principles, methods and applications, Oxford: Oxford University Press. Chapter 11. 1993. [ Links ]
Brune, D. Corrosion of amalgams. Scand. J. Dent. Res., v. 89, p.506-14, 1981. [ Links ]
Corbin, S. B.; Kohn, W. G. The benefits and risks of dental amalgam. J. Amer. Dent. Ass., v. 125, p.381-8, 1994. [ Links ]
Gabrielli, G. C.; Keddam, M. Review of applications of impedance and noise analysis to uniform and localized corrosion. Corrosion, v. 48, p.794-811, 1992. [ Links ]
Gelband, H. The science and politics of dental amalgam. Int. J. Techn. Assess. Healt Care, v. 14, p.123-34, 1998. [ Links ]
Hoar, T. P.; Mears, D. C. Corrosion resistant alloys in chloride solutions: materials for surgical implants. In: Proceedings... Royal Society. Series A, v. 294, p.486-511, 1966. [ Links ]
Lemaitre, L.; Moors, M.; Van Peteghem, A. P. An application of impedance techniques to corrosion research on dental amalgam. J. Oral Rehabil., v. 13, p.479-85 , 1986. [ Links ]
Lin, J.H.C. et al. Microstructures of Cu-rich amalgams after corrosion. J. Dent. Res., v. 62, p.112-5, 1983. [ Links ]
Silverman, D. C. Corrosion rate estimation from pseudo-inductive electrochemical impedance response. Corrosion, v. 45, p.824-30, 1989. [ Links ]
Silverman, D. C.; Carrico, J. E. Electrochemical impedance technique - A practical tool for corrosion prediction. Corrosion, v. 44, p.280-7, 1988. [ Links ]