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Corrosion of the component phases presents in high copper dental amalgams. Application of electrochemical impedance spectroscopy and electrochemical noise analysis

被引：17
作者：
Acciari, HA
Guastaldi, AC
Brett, CMA
机构：
[1] UNESP, Dept Quim Fis, Inst Quim, Araraquara, SP, Brazil
[2] Univ Coimbra, Dept Quim, P-3004535 Coimbra, Portugal
来源：
CORROSION SCIENCE | 2005年 / 47卷 / 03期
关键词：
dental amalgams; amalgam phases; electrochemical impedance spectroscopy (EIS); electrochemical noise analysis; chloride corrosion;
D O I：
10.1016/j.corsci.2004.07.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion resistance of three of the constituent phases in high copper dental amalgams has been investigated by electrochemical methods in 0.9% NaCl solution. Polarization curves show corrosion potentials most positive for gamma(1)-Ag2Hg3, followed by Ag-Cu, and gamma-Ag3Sn in agreement with the order of corrosion resistance deduced from the corrosion currents. Complex plane impedance plots at the open circuit potential showed distorted semicircles with diffusional components at low frequency for Ag-Hg and Ag-Cu, while for gamma-Ag3Sn a layer of corrosion products is formed, partially or completely covering the surface of the electrode. Impedance and noise spectra have been compared in the frequency domain, and show good agreement. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：635 / 647
页数：13
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