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US 4,307,136 AGranted
Process for the chemical deposition of gold by autocatalytic reduction
AssigneeEngelhard Minerals & Chemicals Corporation
InventorsPatrick Prost-Tournier, Christiane Allemmoz
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Abstract
An improvement is disclosed for the nonelectrolytic deposition of gold by autocatalytic chemical reduction of a deposition bath containing a soluble gold salt in a strongly alkaline medium by initially adding to the deposition bath an effective amount of a metal from Group III, IV or V of the periodic classification of elements in the form of a soluble salt.
Claims8
In a process for the nonelectrolytic deposition of gold by autocatalytic chemical reduction of a deposition bath containing a soluble gold salt in a strongly alkaline medium;
- the improvement which comprises adding to said bath a metal selected from the group consisting of aluminum, gallium, indium, thallium, germanium, tin, lead, arsenic, antimony and bismuth in the form of a soluble salt and at essentially the same time as said gold salt, in an amount effective to increase the deposition of gold and maintain bath stability.
Dependencies are inferred from the claim text.