专利名称：Aqueous acid solutions for the
electrodeposition of tin and/or lead/tinalloys
发明人：METZGER, WILLI,SCHMITZ,
MANFRED,SCHMIDT, KARL-JURGEN
申请号：EP90100870.6申请日：19900117公开号：EP0379948A2公开日：19900801
摘要：A description is given of aqueous acid solutions for the electrodeposition of tinand/or lead/tin alloys to improve electroplating in the high current density range andobtain uniform lustre throwing power in metals deposited in the low current densityrange. The solutions according to the invention contain a mixture of metal salts, freealkanesulphonic acid, nonionic wetting agents and, optionally, aromatic short-chainaldehydes and/or, optionally, aromatic ketones and/or, optionally, short-chainunsaturated carboxylic acids. The solutions according to the invention are thereforecharacterised in that tin and/or lead salts of the alkanesulphonic acid are used as metalsalts, the alkyl group of the alkanesulphonic acid consisting of 1 to 5 carbon atoms, andthe free alkanesulphonic acid containing alkyl groups with 1 to 5 carbon atoms. As afurther brightener, the solutions contain a mixture of a reaction product of acetaldehydeand/or its aldol condensation products with ammonia and/or acyclic ketones and/oraliphatic amines, amides, amino acids and/or hydrazine compounds.
申请人：BLASBERG-OBERFLACHENTECHNIK GMBH
地址：Postfach 13 02 51 Merscheider Strasse 165 D-42699 Solingen DE
国籍：DE
代理机构：Werner, Hans-Karsten, Dr.Dipl.-Chem.
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