Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating
Patent
1991-12-19
1992-09-29
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly single metal coating
205296, 205297, C25D 338
Patent
active
051511703
ABSTRACT:
For acid copper plating baths containing a brightener used to produce smooth copper coatings of high brilliancy, it has been found that the "break-in" period normally needed after a brightener is added to the plating bath, has been virtually eliminated by use of the brightener of this invention. This brightener consists essentially of a peroxide oxidation product of a dialkylamino-thioxomethyl-thioalkanesulfonic acid wherein each alkyl and alkane group individually contains 1 to 6 carbon atoms and wherein the peroxide oxidation of the dialkylamino-thioxomethyl-thioalkane-sulfonic acid is carried out in an acid, aqueous medium having a pH of not more than about 1. In an added embodiment of this invention the acid copper plating bath also contains hydrolysis products of the peroxide oxidation product of a dialkylamino-thioxomethyl-thioalkanesulfonic acid.
REFERENCES:
patent: 3359297 (1967-12-01), Gandel
patent: 3502551 (1970-03-01), Todt et al.
patent: 4667049 (1987-05-01), Heikkila et al.
patent: 4948474 (1990-08-01), Miljkovic
King Randal D.
Montgomery Eda R.
Bolam Brian M.
Hauser William P.
Lucas James A.
McGean-Rohco, Inc.
Niebling John
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