Trivalent chromium electrolytes and plating processes employing

Details Trivalent chromium electrolytes and plating processes employing Trivalent chromium electrolytes and plating processes employing

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.

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