Journal of Dental Research, Vol 65, 888-891, Copyright © 1986 by International & American Associations for Dental Research Online Journals
An electrochemical and multispectroscopic study of corrosion of Ag-Pd-Cu-Au alloys
L. Niemi, E. Minni and A. Ivaska
Corrosion of a multi-phase Ag-Pd-Cu-Au-based commercial dental casting
alloy and a Cu-Pd-rich and Ag-rich single-phase alloy was studied by
open-circuit potential measurements, atomic absorption spectrometry, and
electron spectroscopy. The alloys were immersed in an artificial saliva
solution for 24 hr while the open-circuit potentials of the alloys were
measured. The potentials were found to stabilize at certain levels after a
steep rise during the first hours of the experiment. Cu was found to
dissolve considerably from the Cu-Pd-rich alloy, with simultaneous
enrichment of Pd in the surface layer of the alloy. Ag dissolved slightly
from the Ag-rich alloy, but both Cu and Ag were found to dissolve from the
multi-phase alloy. Neither Pd nor Au dissolved from any of the alloys
studied.
