Aqueous acidic solutions for the electrodeposition of tin and le

Details Aqueous acidic solutions for the electrodeposition of tin and le Aqueous acidic solutions for the electrodeposition of tin and le

1990-01-23

1991-06-04

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 53, 204 541, C25D 356

Patent

active

050211307

ABSTRACT:
Described are aqueous acidic solutions for the electrodeposition of tin and lead/tin alloys for improving electro- deposition in the high current density range and for providing a uniform luster distribution of metals deposited in the low current density range. The solutions contain a mixture of metal salts, free alkanesulfonic acid, a non-ionic wetting agent and optionally aromatic short-chain aldehydes and/or optionally aromatic ketones and/or optionally short-chain unsaturated carboxylic acids. In the solutions, tin and/or lead salts of the alkanesulfonic acid are employed as the metal salt(s), the alkyl moiety of the alkanesulfonic acid consisting of from 1 to 5 carbon atoms, the free alkanesulfonic acid having alkyl moieties with from 1 to 5 carbon atoms. They contain, as a further brightener, a mixture comprising a reaction product of acetaldehyde and/or its aidol condensation product with ammonia and/or acyclic ketones and/or aliphatic amines, amides, amino acids and or hydrazine compounds.

REFERENCES:
patent: 4582576 (1986-04-01), Opaskar et al.

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