MATERIALS SCIENCE Polarization-Corrosion Behavior of Commercial Gold- and Silver-base Casting Alloys in Fusayama Solution*

Based on polarization measurements, high Au alloys are highly cor-rosion-resistant and exhibit the lowest corrosion rates; intermediate Au, Ag, and Pd alloys with Cu are passive but exhibit higher corro-sion rates. Twenty weight percent (w/o) In-Ag alloys exhibit active corrosion behavior at potentials only 100 m V noble to the corrosion potential