Effects of decreased alloy nobility are measured with respect to copper and silver corrosion activity. A potentiodynamic technique is developed for this analysis. It is shown that copper and silver have characteristic potentials for which individual current densities are maximal. Identification of characteristic potentials allows the definitive analysis of 11 commercial crown and bridge alloys for copper and silver corrosion. It is shown that microstructure, as well as alloy chemistry, plays a major role in determining corrosion resistance.
Get full access to this article
View all access options for this article.
References
1.
Sarkar, N.K. ; Fuys, R.A.; and Stanford , J.W.: The Chloride Corrosion Behavior of Silver-base Casting Alloys, J Dent Res58: 1572, 1979.
2.
Huget, E.F.; Dvibedi, N.; and Cosner, H.E.: Characterization of "Economy" Crown and Bridge Alloys, IADR Progr & Abst55: No. 697, 1976.
3.
Standard Reference Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements, American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA19103.
4.
Fontana, M.G. and Green, N.D.: Corrosion Engineering, New York: McGraw-Hill, 1967.
