Abstract
The results of an attempt in using cyclic voltammetry for characterization of gold, silver, copper and 18-k gold alloys by their anodic behavior in 1 mol/dm3 H2SO4 are presented in this paper. Gold alloys containing 75 mass% Au are named as 18-k gold, but it is usually three component alloy containing 75 mass% Au, 12.5 mass% Ag and 12.5 mass% Cu as the main components. Investigated alloys were obtained by melting powders of pure metals mixed in corresponding ratio, casting, cooling in air, rolling and drawing in the wire shape. To achieve the required mechanical properties, the alloys had heat-treated three times. Each alloy exhibits characteristic current peaks on voltammogram that can be used to recognize the kind of present alloying metal in gold. Also, the content of the alloying metal can be roughly estimated from the peak value of current densities.
Highlights
Cyclic voltammograms obtained for pure silver at different sweep rates in unimolar sulphuric acid
Cyclic voltammograms obtained for pure gold, 18k Au−Ag and 18k Au−Ag−Cu at the sweep rate of 100 mV/s in unimolar sulphuric acid
The content of the alloying metal can be roughly estimated from the peak value of current densities
Summary
U radu su prikazani rezultati ispitivanja mogućnosti primene ciklične voltametrije za određivanje faznog sastava zlata čistoće 18 karata (75% Au + legirni elementi Ag i Cu, u odnosu 1:1), kao i dvokomponentnih legura metala koji ulaze u njegov sastav. U elektrohemiji se već izvesno vreme koristi metoda ciklične voltametrije [1] za karakterizaciju dvokomponentnih legura i čistih metala [2,3,4,5,6,7,8,9]. Najpre su snimani voltamogrami čistih metala koji čine leguru, a zatim i kombinacija dvokomponentnih legura, u istom odnosu kao u osamnaestokaratnom zlatu, da bi najzad to isto bilo učinjeno za samu trokomponentnu leguru. Pri čemu je utvrđeno da reakcija (11) predstavlja spori stupanj u ovom mehanizmu [14]
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