Process for separating multivalent metal ions from autodepositio

Details Process for separating multivalent metal ions from autodepositio Process for separating multivalent metal ions from autodepositio

1993-08-05

1995-04-25

McFarlane, Anthony

Coating processes

Immersion or partial immersion

Metal base

4273881, 4273884, 502 27, B05D 302

Patent

active

054097371

ABSTRACT:
The use of chelating type cation exchange resins, particularly those with iminodiacetic acid functionality, to remove dissolved multivalent cations such as iron, zinc, and chromium from used autodeposition compositions permits reuse of the autodeposition compositions without the need for added surfactant and without developing any undesirable graininess or other texture in the coatings formed. The cation exchange resins can be efficiently regenerated with 0.5 to 4% by weight aqueous hydrofluoric acid.

REFERENCES:
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patent: 4800106 (1989-01-01), Broadbent
patent: 5164234 (1992-11-01), Siebert
patent: 5248525 (1993-09-01), Siebert
"Ion-Exchange Separations", R. E. Anderson, Handbook of Separation Techniques for Chemical Engineers (McGraw-Hill, New York, 1979).
Ion Exchange Resins Amberlite.RTM. IRC-718 (Rohm & Haas Co., Philadelpha, 1988).
Purolite Ion Exchange Resins, Purolite S-930.
Rhoplex.RTM. WL-81 and Rhoplex WL-91, (Rohm & Haas Co., Philadelphia, 1980).
Amberlite.RTM. 200, (Rohm & Haas Co., Philadelphia, 1980).
Lewatit TP 207, Mobay Corp., Pittsburgh, Pa. (A division of Bayer USA Inc.).

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