Electrochemical Behavior of Gold Alloys,

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jan 10, 1979
Accession Number
ADA064705

Entities

People

  • Eugene F. Huget
  • Faris A. Modawar
  • Laszlo B. De Simon
  • Stanley G. Vermilyea

Organizations

  • United States Army Institute of Surgical Research

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Alloys
  • Anodic Polarization
  • Base Metal
  • Chlorides
  • Corrosion
  • Corrosion Resistance
  • Current Density
  • Dental Materials
  • Electrodes
  • Gold
  • Gold Alloys
  • Laboratory Procedures
  • Materials
  • Metals
  • Polarization
  • Resistance
  • Transitions

Readers

  • Geochemistry
  • Materials Science and Engineering.
  • Thin Film Deposition Science.