Corrosion and Tarnish of Dental Silver-based Alloys in 0.1% Na<sub>2</sub>S and Ringer's solutions

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  • ENDO Kazuhiko
    Department of Dental Materials Science, School of Dentistry, Higashi-Nippon-Gakuen-University
  • ARAKI Yoshima
    Department of Dental Materials Science, School of Dentistry, Higashi-Nippon-Gakuen-University
  • OHNO Hiroki
    Department of Dental Materials Science, School of Dentistry, Higashi-Nippon-Gakuen-University

Bibliographic Information

Other Title
  • 歯科用銀基合金の腐食と変色
  • Corrosion and Tarnish of Dental Silver-based Alloys in 0.1% Na2S and Ringer's solutions
  • (Part 1) Electrochemical Study

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Description

The corrosion behavior of three silver-based alloys, Ag-Sn-Zn, Ag-In, and Ag-Pd-Cu, were investigated by potentiodynamic anodic polarization analysis and the polarization resistance method in 0.1% Na2S and Ringer's solutions.<br>The corrosion activity of the Ag-Sn-Zn alloy was higher in Ringer's solution than in the 0.1% Na2S solution. In contrast, the corrosion rate of the Ag-Pd-Cu alloy was approximately 500 times higher in the 0.1% Na2S solution than in Ringer's solution. The results show that the generally accepted concept that tranish is merely a surface discoloration due to the deposition of insoluble products is inadequate. The alloy discolors while being severely attacked in the presence of sulfides. For the Ag-In alloy, the corrosion activity in the 0.1% Na2S solution was as high as in Ringer's solution.<br>These silver-based alloys exhibit different electrochemical activities in different solutions. The test solutions for corrosion tests must be carefully chosen for each alloy system through a screening test to replicate the predominant corrosion reaction proceeding in the oral environment.

Journal

  • Dental Materials Journal

    Dental Materials Journal 8 (1), 46-55,123, 1989

    The Japanese Society for Dental Materials and Devices

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