Process and composition for the electrodeposition of tin

Details Process and composition for the electrodeposition of tin Process and composition for the electrodeposition of tin

C - Chemistry, Metallurgy

25

D

204/27, 204/39,

C25D 3/32 (2006.01) C25D 3/60 (2006.01)

Patent

CA 1193224

-13- ABSTRACT OF THE DISCLOSURE An electroplating bath for the high speed deposition of bright metallic tin utilizing tin fluoroborate and sulfuric acid as the electrolyte; wherein, in addition to certain other additives, the bath contains a perfluoroalkyl sulfonate wetting agent to promote anode corrosion. Brighteners used in the system include aromatic amines and aliphatic aldehydes. For certain purposes it may be advantageous to include boric acid as part of the electrolyte; and, in other instances, to use an aromatic sulfonic acid to enhance bath stability and brightness. The method of utilizing a bath containing tin fiuoroborate in a sulfuric acid matrix containing these perfluoroalkyl sulfonate wetting agents is also described.

398817

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