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 Ringer's solution ((C1-)approx. 24 m Eq/L). 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.