Process for the treatment of stainless steel for a direct galvanic gold plating
AssigneeDegussa AG
InventorsWerner Kuhn, Wolfgang Zilske
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Abstract
For the direct gold plating of stainless steel parts in acid baths there is needed a pretreatment of the parts. Known processes operate with corrosive media such as strong acids and attack the surface. These disadvantages are avoided by putting the stainless steel part in an electrolytic, aqueous solution and first treating cathodically and subsequently anodically.
Claims19
A process for the pretreatment of stainless steel to make it adaptable to direct electrolytic gold plating in an acid gold plating bath having a pH below 3 comprising placing a stainless steel part in a cyanide containing aqueous solution consisting of water, an alkali hydroxide and alkali cyanide alone or together with at least one member of the group consisting of alkali metal phosphates, alkali metal condensed phosphates, alkali metal carbonates and alkali metal silicates and then treating the stainless steel first cathodically and then anodically.
Dependencies are inferred from the claim text.