Corrosion Resistance of Zambian Silver Coin from the African Wildlife Series

I. G. Erusalimchik^a, M. N. Filippov^b, and I. V. Murav’eva^b

^a Moscow Institute of Radio Engineering, Electronics, and Automatic Control (Technical University),
pr. Vernadskogo 78, Moscow, 117454 Russia

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^b Moscow State Institute of Steel and Alloys (Technological University),
Leninskii pr. 4, Moscow, 119049 Russia

Received September 11, 2005

Abstract — The surface of Zambian silver coin from the “African Wildlife” series is studied by local X-ray fluorescent analysis, mass-spectrometry, and electrode potential measurements. High purity of the coin metal is pointed out. Faint yellow tarnish at some spots on the surface is caused by local contamination during the coin production or storage.