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Henkel Kommanditgesellschaft Auf Aktien

Gerhard Collardin Gmbh

Krupp Hoesch Stahl Ag

Dieter Geruhn

Joerg Riesop

Raschad Mady

Hubertus Peters

Frank Panter

Manfred Wessel

Franz Ricke

Roland Morlock

Jobst H Meyer Zu Bexten

Juergen Verheien

Lutz Leyhe

Andreas Klare

Franz-Gerd Ricke

Winand Hanelt

A process for controlling the layer weight during the phosphating of steel strip zinc-coated on one or both sides, using a phosphating solution which contains 1 to 6 g/l zinc ions and 10 to 30 g/l phosphate ions, characterized in that a Fe(II) ion content within the range of 3 to 100 mg/l is established in the phosphating solution. The higher the Fe(II) content, the lower is the layer weight. An alteration in the Fe(II) content of 3 to 20 mg/l results in an alteration in the layer weight of about 0.1 g/m .

Method for controlling the coating weight for strip-phosphating

Process for phosphating steel strip galvanized on one side

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

Growing community of inventors

Werl, Germany

Dieter Geruhn