Formulations and procedures for the deposition of precious metals onto solid substrates are disclosed wherein the formulations are iodide-free and contain an organosulfur compound and/or a carboxylic acid and a source of soluble precious metal ion which is one or more precious metal alkanesulfonates, precious metal alkanesulfonamides and/or precious metal alkanesulfonimides. The formulations and processes may be cyanide-free, and the deposition may be effected by electrolytic, electroless and/or immersion plating techniques.

Precious metal deposition composition and process

Electroplating solutions for the deposition of palladium or the alloys thereof, in which solutions palladium was added in the form of the reaction product of palladium diaminodinitrite with an acid in the presence of a scavenging agent for nitrous acid

Method and electroplating solution for deposition of palladium or alloys thereof

Methods for increasing the ductility and reducing the porosity and cracking tendency of a palladium or palladium-silver electrodeposit which comprises providing an underlayer of a palladium/nickel or palladium/cobalt alloy electrodeposit. Also dual layer composite electroplated deposits and their use in electrical contacts or connectors.

Electrical contacts and methods of making contacts by electrodeposition

Alkaline aqueous electrolytes for the electrodeposition of palladium comprising a soluble palladium compound, one or more complexing agents of an organic compound containing a heterocyclic ring having one or more nitrogen atoms in the ring position, at least one carboxyl group substituted on a ring carbon, and at least one hydroxyl or carbonyl oxygen attached to a ring carbon. The palladium compound and complexing agents are soluble in the electrolyte. Optionally, one or more soluble alloying metal compounds can be added to the electrolyte when palladium alloys are to be electrodeposited therefrom. Also, methods for formulating these electrolytes and for electrodepositing palladium or palladium alloys therefrom.

Alkaline baths and methods for electrodeposition of palladium and palladium alloys

The invention relates to a method for producing gold-coloured aluminium oxide layers, whereby the oxidised surface of the aluminium or aluminium alloy is coloured in an electrolyte containing an alkane sulfonic acid and a silver alkane sulfonate by means of an electrolytic method. The invention also relates to using of the gold-coloured aluminium or aluminium alloy workpieces produced by said method for decorative purposes. The invention further relates to an electrolyte solution for the gold coloration of the oxidised surface of aluminium or an aluminium alloy by means of an electrolytic method, and the use of an electrolyte containing a silver alkane sulfonate for the gold coloration of aluminium oxide layers in aluminium and aluminium alloys in an electrolytic method.

Method for producing gold-coloured surfaces pertaining to aluminium or aluminium alloys, by means of formulations containing silver salt

Aqueous electroplating solutions for the electrodeposition of palladium-silver alloys comprising a soluble palladium compound, a soluble silver compound and an excess of a strong acid in an amount sufficient to maintain the palladium and silver compounds in solution and process for electrolytically plating palladium-silver alloys.

Fred I. Nobel

Papers

Electrodeposition of palladium-silver alloys