Henkel Ag & Company, Kgaa

Gerhard Collardin Gmbh

Krupp Hoesch Stahl Ag

Raschad Mady

Roland Morlock

Dieter Geruhn

Franz Ricke

Horst-Dieter Speckmann

Joerg Riesop

Karl-Heinz Gottwald

Karl-Dieter Brands

Hubertus Peters

Reinhard Seidel

Frank Panter

Gerard Veldman

Manfred Wessel

Jobst H Meyer Zu Bexten

Uwe Karmaschek

Lutz Leyhe

Winand Hanelt

Detlev Bohnhorst

Caecillie Daniel

Christian Ries

Juergen Verheien

Chromium-free process for the no-rinse treatment of aluminum and its

Process for phosphating steel strip galvanized on one side

Process for phosphating metallic surfaces

A method for phosphate coating zinc or nickel-zinc alloy electrolytically coated metal surfaces, in which they are exposed to a phosphating solution containing zinc, manganese, and phosphate ions, and optionally cobalt and/or nitrate ions. The method is conducted at an elevated temperature for up to slightly more than 5 seconds.

Process for phosphating electrolytically zinc-coated metals

The invention relates to a process for treating metal surfaces, preferably of aluminum, aluminum alloys and steel, for the subsequent application of organic coating compositions. The metal surfaces are wetted with an aqueous bath solution containing chromium(III)ions, fluoride ions and an organic film former which is soluble or homogeneously dispersible in water, after which the solution applied is dried and converted by heating into a water-insoluble film. The bath solution preferably contains the following constituents and approximate quantities thereof: 0.5 to 10 g/l of chromium(III)ions, 0.55 to 11 g/l of fluoride ions, 0.6 to 12.5 g/l of phosphate ions, and 0.15 to 5.0 g/l of organic film former. The organic film former preferably used is a polymer containing free carboxyl groups, more preferably a homopolymer and/or copolymer of acrylic and/or methacrylic acid.

Process and aqueous compositions for treating metal surfaces

A process for phosphating zinc-plated metal articles, particularly electrolytically zinc-plated steel sheets, by treatment thereof for a short period with an acidic phosphating solution which, in addition to zinc and phosphate ions, can contain other metal cations and/or anions of oxygen-containing acids having an accelerating effect, wherein the phosphating solution has a content of Zn.sup.2+ -cations of between about 1 and 2.5 g/l, a free acid content in the range from 0.8 to 3 points, and the acid ratio of total acid to free acid in the range from 5 to 10. The phosphating treatment is carried out for a period of time not in excess of about 5 seconds.

Phosphating process for zinc-plated metals

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Frechen, Germany

Raschad Mady