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A model for the corrosion behavior of dental amalgams

✍ Scribed by Lemaitre, L. ;Moors, M. ;Van Peteghem, A. P.

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 521 KB
Volume: 23
Category: Article
ISSN: 0021-9304
DOI: 10.1002/jbm.820230208

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✦ Synopsis

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 nonfaradaic 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 NaHCO, and of the differences between conventional and Cu-rich dental amalgams.

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