Palladium electroplating procedure
AssigneeBell Telephone Laboratories, Incorporated
InventorYutaka Okinaka
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Abstract
A palladium electroplating procedure is described in which the bath is replenished by palladium hydroxide made in a special way. The palladium hydroxide is made by oxidation of palladium diammine dichloride in alkaline aqueous solution using hypochlorite ion as the oxidizing agent. Palladium hydroxide is ideal as a replenishing agent for palladium electroplating baths because it neutralizes hydrogen ions produced in the electroplating process and does not yield anions that accumulate in the bath.
Claims18
A process for electroplating a metallic substance on a surface, said metallic substance comprising palladium, comprising the step of passing current through a cathode, an electroplating bath and an anode with cathode potential great enough to electroplate palladium and said electrochemical bath having a conductivity greater than 10.sup.-3 mho-cm characterized in that the electroplating bath is replenished by the addition of palladium hydroxide made by the oxidation of palladium diammine dichloride by hypochlorite ion in an alkaline aqueous solution.
Dependencies are inferred from the claim text.