Anti-tarnish silver alloys in system Ag-Cu-Zn-Si with the addition of aluminum

  • Marija Korać Faculty of Technology and Metallurgy, University of Belgrade https://orcid.org/0000-0003-0396-0974
  • Stevan Dimitrijević Innovation center of the Faculty of Technology and Metallurgy in Belgrade Ltd.
  • Kemal Delijić Faculty of Metallurgy and Technology, University of Montenegro
  • Željko Kamberović
Keywords: anti-tarnish silver, alloy, corrosion resistance, sulfidization, Ag-Cu-Zn-Al-Si system

Abstract

This paper presents investigations of aluminum addition influence on the corrosion characteristics of the sterling silver Ag-Cu-Zn-Si alloys. The procedure for obtaining Ag-Cu-Zn-Al-Si alloys in small ranges of predefined composition was also presented. Open circuit potential measurements, linear polarization resistance method and potentiodynamic polarization tests were employed to determine corrosion characteristics of the alloys. The materials were tested in a 0.01M sodium sulfide solution. It was shown that the addition of aluminum improves sulfidization resistance and corrosion characteristics. Best results are achieved for the alloy with the following composition 92.5% Ag, 1.9% Cu, 3.7% Zn, 1.6% Al and 0.3% Si.

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Published
2018-10-19
Section
Full length research papers