A model for the corrosion behavior of dental amalgams.
At high frequencies, electrochemical impedance behavior for corroding dental amalgams cannot be interpreted in terms of a simple Randles equivalent circuit. This may often be ascribed to the imperfect cell geometry resulting in a nonuniform current distribution. However, the insertion of a constant phase element (CPE) in the non-faradaic branch of the equivalent circuit offers a new scope for interpretation as the circuit provides an m-parameter corresponding to the degree of distortion. The decrease of m as a function of time was explained by a mathematical model reflecting an increasing number of pores. Moreover, that same model allows a better understanding of the passivating effect of NaHCO3 and of the differences between conventional and Cu-rich dental amalgams.
Lemaitre
L
L
Laboratory of Non-Ferrous Metallurgy, State University of Ghent, Belgium.
Moors
M
M
Van Peteghem
A P
AP
D001672:Biocompatible Materials; D003343:Corrosion; D003723:Dental Amalgam; D004563:Electrochemistry; D008422:Materials Testing; D008956:Models, Chemical; D008962:Models, Theoretical
D001672:Biocompatible Materials; D003723:Dental Amalgam