| 摘要 |
<p>Gold and bismuth are electrolytically co-deposited from a solution containing, preferably 12 g/l gold as an alkali metal auricyanide, and bismuth as the salt of a weak acid, preferably citric acid. Alkali metal citrate and citric acid are preferably used to buffer the soln. at pH 4-8, pref. 7. The bismuth concentration used depends on the alloy required and the current density. Alloys with bismuth concentrations above 35% are used for microcircuit encapsulation, while alloys with less than 20% bismuth are used as sputtering cathodes.</p> |
