Henkel Kommanditgesellschaft Auf Aktien

Gerhard Collardin Gmbh

Kurt Hosemann

Karl-Heinz Gottwald

Reinhard Opitz

Willi Wuest

Hubert Harth

Joerg Riesop

Heinz Portz

Process not using chlorate or nitrite for the production of nickel and

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.

Process for desludging phosphating baths and device for carrying out

The present invention relates to a process for phosphating metal surfaces, and more specifically of surfaces of iron, zinc, and aluminum and the alloys thereof as a pretreatment for cold working wherein the surfaces without previous activation are contacted in a temperature range of from 30.degree. C. to 70.degree. C. with an aqueous solution containing

Process for phosphating metal surfaces

A composition for the after-passivation of phosphated metal surfaces and a method for its use, the composition containing at least one water soluble salt of tetravalent titanium or divalent manganese, cobalt, nickel or copper.

After-passivation of phosphated metal surfaces

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Titz, Germany

Kurt Hosemann