Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating
Patent
1990-11-05
1993-01-12
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly single metal coating
210735, 204DIG13, 423 54, C25D 306, C01G 3700, B01J 3900
Patent
active
051787466
ABSTRACT:
A new method for purification of trivalent chromium electroplating baths contaminated with cationic metal ions is disclosed. In this purification process, the contaminated trivalent chromium is passed at the pH level of the bath through one or more columns containing an ion-exchange resin having the picolylamine group as the functional moiety. The cationic metal ions are preferentially bound to the resin while the trivalent chromium is passed through the resin with substantially no adsorption thereby purifying the electroplating bath. This process is preferably performed simultaneously with the electroplating process.
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Darnall Dennis W.
Gardea-Torresdey Jorge L.
McPherson Robert A.
Bio-Recovery Systems, Inc.
Bolam Brian M.
Niebling John
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