Electrodeposition baths containing calcium salts

Details Electrodeposition baths containing calcium salts Electrodeposition baths containing calcium salts

1998-07-10

2000-07-04

Mayekar, Kishor

Chemistry: electrical and wave energy

Processes and products

Electrophoresis or electro-osmosis processes and electrolyte...

204505, 204506, 523415, C25D 1310

Patent

active

060833734

ABSTRACT:
Disclosed are improved electrodeposition bath compositions comprising a resinous phase dispersed in an aqueous medium, the resinous phase being comprised of an active hydrogen containing ionic electrodepositable resin and a curing agent, where the improvement comprises the addition to a lead-free electrodeposition bath of at least one calcium compound in an amount of about 10 to 10,000 parts per million of total calcium and not more than about 200 parts per million soluble calcium, based on electrodeposition bath weight. The electrodeposition bath compositions are preferably cationic and provide for excellent corrosion resistance over a variety of metal substrates including untreated steel. Also disclosed is a method of electrocoating a conductive substrate using the improved electrodeposition bath compositions of the invention. Metallic substrates which are coated using the method of the invention are also disclosed.

REFERENCES:
patent: 4294621 (1981-10-01), Maurer et al.
patent: 5034109 (1991-07-01), Fujibayashi et al.
patent: 5369151 (1994-11-01), Fujibayashi et al.
patent: 5587059 (1996-12-01), Yamoto et al.
patent: 5718817 (1998-02-01), Bossert et al.

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