Dental Materials
Volume 24, Issue 8 , Pages 1009-1016, August 2008

Corrosion behavior of palladium–silver–copper alloys in model saliva

  • Ludek Joska

      Affiliations

    • Institute of Chemical Technology, Department of Metals and Corrosion Engineering, Technicka 5, 166 28 Prague 6, Czech Republic
    • Corresponding Author InformationCorresponding author. Tel.: +420 220444204; fax: +420 220444400.
    • ,
  • Marcela Poddana

      Affiliations

    • Institute of Chemical Technology, Department of Metals and Corrosion Engineering, Technicka 5, 166 28 Prague 6, Czech Republic
    • ,
  • Jindrich Leitner

      Affiliations

    • Institute of Chemical Technology, Department of Solid State Engineering, Technicka 5, 166 28 Prague 6, Czech Republic

Received 22 May 2006; received in revised form 27 November 2006; accepted 21 November 2007.

Abstract 

Objectives

Palladium–silver system alloyed with other metals represents one of possible material choices in prosthetics. Its corrosion properties are influenced by minority components added in order to obtain the properties required for stomatological purposes. The objective of this work was to ascertain the influence of copper on the corrosion mechanism of palladium–silver alloys.

Methods

Corrosion properties of four palladium–silver–copper alloys were compared with the behavior of the palladium–silver binary system. Standard electrochemical measurements in a model saliva solution were complemented with an XPS analysis of the specimens surface. Experimental data were compared with the results of thermodynamic analysis.

Results

The foregoing study revealed formation of a saline layer of insoluble silver compounds as the dominant feature of the corrosion mechanism in a binary system. This process is suppressed in ternary alloys where electrochemical reactions of copper take place on the alloy-electrolyte phase boundary leading to the formation of a layer based on copper oxides.

Significance

The alloying of the palladium–silver binary system with copper results in an important change in the corrosion behavior of ternary alloys. A change in the mechanism of interaction with the environment leads to susceptibility to non-uniform corrosion.

Keywords: Palladium dental alloys, Electrochemistry, XPS analysis, Thermodynamic analysis, Corrosion mechanism

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PII: S0109-5641(07)00280-1

doi:10.1016/j.dental.2007.11.017

Dental Materials
Volume 24, Issue 8 , Pages 1009-1016, August 2008

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