Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating
Patent
1991-08-01
1993-03-23
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly single metal coating
205287, 205290, C25D 306
Patent
active
051961091
ABSTRACT:
An improved aqueous acidic trivalent chromium electrolyte and process for increasing the tolerance thereof to the presence of deleterious contaminating metal ions and organic impurities which normally progressively increase during commercial operation of the electrolyte ultimately resulting in chromium electrodeposits which are commercially unsatisfactory due to the presence of streaks, clouds, and hazes in the deposit. The improved composition contains an effective amount of at least one EDTA compound which is effective to mask the adverse effects of such contaminating metal and organic impurities and which also enhances the codeposition of such metal contaminants on the parts being plated thereby reducing, and in some instances, preventing the accumulation of such contaminating metal ions in the electrolyte.
REFERENCES:
patent: 3833485 (1974-09-01), Crowther et al.
patent: 4142948 (1979-03-01), Tajima et al.
patent: 4221832 (1980-09-01), Philippe et al.
patent: 4432843 (1984-02-01), Tremmel
patent: 4448648 (1984-05-01), Barclay et al.
patent: 4473448 (1984-09-01), Deeman
patent: 4673471 (1987-06-01), Kagechika et al.
patent: 4810336 (1989-03-01), Martyak
Chemical Abstract 105:104632k, Sep. 22, 1986.
Chemical Abstract 77:13281g, Jul. 10, 1972.
Bolam Brian M.
Niebling John
LandOfFree
Trivalent chromium electrolytes and plating processes employing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Trivalent chromium electrolytes and plating processes employing , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trivalent chromium electrolytes and plating processes employing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1349643