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A mechanistic study of the electrochemical corrosion of the γ 2 phase in dental amalgams. II. Introduction of a model
Author(s) -
LEMAITRE L.,
MOORS M.,
PETEGHEM A. P.
Publication year - 1989
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1989.tb01376.x
Subject(s) - equivalent circuit , polarization (electrochemistry) , corrosion , electrical impedance , anode , electrochemistry , materials science , phase angle (astronomy) , composite material , chemistry , electrode , voltage , optics , physics , electrical engineering , engineering
Summary Electrochemical impedance measurements on conventional dental amalgams at an anodic polarization potential of −250 mV vs. SCE were performed. An initial evaluation was given in part I of this study; in the second part the results are interpreted in terms of a model. The latter, characterized by an equivalent circuit, is a parallel combination of a flat surface and a pore. The selection of appropriate values for the elements of the equivalent circuit leads to a better insight into the corrosion process. Although no simple relationship exists between the circuit elements and the impedance curves, an explanation was found for some typical features of these curves. As an application, the influence of the anodic polarization potential on the impedance curves was studied. Evaluation by means of the model demonstrated the importance of the characteristics of the corrosion products.