Process for desludging phosphating baths and device for carrying

Details Process for desludging phosphating baths and device for carrying Process for desludging phosphating baths and device for carrying

1988-12-13

1990-11-06

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148262, C23C 2207

Patent

active

049683608

ABSTRACT:
The development of sludge in phosphating baths is prevented by continuously diverting a partial volume of the baths into a separate device comprising three open chambers: an oxidation chamber where the solution is treated with an O.sub.2 -containing gas to oxidize the iron (II) of the solution of iron (III), which precipitates as phosphate; a conditioning chamber in which the iron (iii) phosphate precipitate formed in the oxidation chamber is agglomerated into a readily sedimented form; and a sedimentation chamber in which the sediment formed in the conditioning chamber is separated from the remaining liquid phosphating solution. This solution is then replenished with phosphate layer-forming components, and the replenished solution is subsequently recycled to the phosphating bath.

REFERENCES:
patent: 3874951 (1975-04-01), Hill
patent: 3992300 (1976-11-01), Hill

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