Effect of microstructure on the corrosion behaviour of dental gold alloys

Masaharu Nakagawa, S. Matsuya, M. Ohta

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The effect of microstructure on the corrosion behaviour of Au-Cu-11 at % Pd, Au-Cu-11 at % Ag and (Au-Cu-11 at % Ag)-5 at % Pd alloys was studied by anodic potentiodynamic and potentiostatic polarization tests. The single-phase Au-Cu-11 at % Pd alloys had high corrosion resistance and their potentiodynamic polarization curves were simple. The high-nobility Au-Cu-11 at % Ag alloy displayed high corrosion resistance regardless of its microstructure. The two-phase Au-Cu-11 at % Ag and (Au-Cu-11 at % Ag)-5 at % Pd alloys had lowered corrosion resistance compared with the single-phase alloys. Anodic potentiodynamic polarization curves of the two-phase alloys were complex, but they were explained by superimposing the curves of each phase using the principle of additivity. The potential at which the current density sharply increased corresponded with that of each phase, and the value of current density was calculated as the sum of the current density of each phase and taking account of their volume fractions. In the anodic potentiodynamic polarization, there was little galvanic effect between the two phases.

Original languageEnglish
Pages (from-to)114-118
Number of pages5
JournalJournal of Materials Science: Materials in Medicine
Volume3
Issue number2
DOIs
Publication statusPublished - Mar 1 1992

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemical Engineering(all)
  • Biophysics

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