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Henkel Kommanditgesellschaft Auf Aktien

Thyssen Krupp Ag

Thyssenkrupp Steel Europe Ag

Krupp Hoesch Stahl Ag

Frank Panter

Joerg Riesop

Hubertus Peters

Dieter Geruhn

Manfred Wessel

Fabian Junge

Raschad Mady

Nicole Weiher

Franz Ricke

Gregor Müller

Heinrich Meyring

Franz-Gerd Ricke

Andreas Klare

Juergen Verheien

A method of activating a metal surface, such as a galvanized steel sheet, before a phosphating process, may involve bringing the metal surface into contact with an activating bath containing activating particles, which may be based on phosphate and/or titanium, dispersed in water. To alleviate or even eliminate the problems of poor adhesion of surface coatings to preferably electrolytically galvanized, phosphated metal strip, an additive that suppresses or at least slows agglomeration of the activating particles may be added to the activating bath. In some examples, polyethylene glycol (PEG) and/or sodium stearate may be added. Further, the particle size distribution of the activating particles present in the activating bath may be determined and the activating bath may be replaced or taken out of operation as a function of the particle size distribution of the activating particles.

Method for activating metal surfaces to be phosphated

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

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Dortmund, Germany

Frank Panter