Coating processes – Immersion or partial immersion – Metal base
Patent
1997-11-17
1999-08-31
Utech, Benjamin
Coating processes
Immersion or partial immersion
Metal base
427352, 4274431, B05D 118
Patent
active
059451700
ABSTRACT:
The use of selected cation exchange resins to remove dissolved multivalent cations ions 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. Iminodiacetate cation exchange resins are very effective for removing iron ions when they are the only multivalent ions to be removed, and can be efficiently regenerated with 0.5 to 4% by weight aqueous hydrofluoric acid. By proper choice of other cation exchange resins and operating conditions, zinc can be selectively extracted from autodeposition baths containing both iron and zinc, and either iron or zinc can be selectively displaced from the loaded ion exchange resin.
REFERENCES:
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patent: 4303704 (1981-12-01), Courduvelis et al.
patent: 5393416 (1995-02-01), Kozak et al.
patent: 5409737 (1995-04-01), Kozak et al.
"Ion-Exchange Separations", R.E. Anderson, Handbook of Separation Techniques for Chemical Engineers (McGraw-Hill, New York, 1979).
Ion Exhange Resins AMBERLITE .RTM. -718 (Rohm & Haas Co., Philadelphia, 1988).
Ahmed Bashir M.
Haas Christina M.
Kozak William G.
Henkel Corporation
Jaeschke Wayne C.
Jaeschke, Jr. Wayne C.
Umez-Eronini Lynette T.
Utech Benjamin
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