Silver and silver alloys containing 1-4% Zn and 1-2% Al were polished electrolytically by using various solutions containing 8gr NaCN, 8-1gr K
4Fe(CN)
6, 8-0.5gr KAg(CN)
2, 8-1gr K
2CO
3 and 8-1gr Zn(CN)
2 in 100cc H
2O.
Secondly tarnish-resisting properties of these specimens were investigated by using 1/10N, Na
2S at 15°
It was shown that the surfaces electrolytically polished have remarkably strong tarnish-resisting property.
The larger the amount of zinc in the silver-zinc alloys is, the easier the electrolytic polishing is, and the larger the tarnish-resisting property becomes, while in the case of silver-alminium alloys both the electrolytic polishing and the tarnish-resisting properties are deteriorated. The best result has been obtained by the solution containing 8gr NaCN, 1gr Zn(CN)
2 and 1gr K
2CO
3 in 100cc H
2O. Peculiar structures were sometimes seen on the polished surface, probably for the heavy current density and the high concentration of the solution, the structures being different by various solutions.
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