Electrochemical Behavior of Gold Alloys,
ARMY INST OF DENTAL RESEARCH WASHINGTON D C
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Reactions resulting from polarization of five dental golds were studied. Test materials included an ADA certified type III alloy oro B-2 three economy alloys midas, Neycast and Minigold and a high-fusing alloy Olympia. The solvent was dilute lactated Ringers solution C1-approx. 24 m EqL. Anodic scans over potentials of -0.1 to 1.9 V vs SCE defined the active, passive the transpassive ranges of the alloys. Anodic polarization curves gave values for primary passive potential Epp and critical current density Ic. Reduction phenomena were observed with cathodic scans over potentials of 1.9 to -0.1 V vs SCE. Intersection of anodic and cathodic curves delineated corrosion potential Ecorr and corrosion current density Icorr. Potentials required to elicit a noble to active transition ranged from .020 V for Neycast to .093 V for Olympia. Analysis of electrochemical profiles revealed that at a chloride ion concentration comparable to that of human saliva, only Oro B-2 and Olympia exhibited the ability to passivate spontaneously.
- Medicine and Medical Research
- Properties of Metals and Alloys