Metallgesellschaft Aktiengesellschaft

Margit Fleischhacker-Jeworrek

Thomas Kolberg

Peter Schubach

Joachim Heitbaum

Klaus Wittel

Dieter Jentsch

Ralf Stickler

Peter Jorns

Michael Lenhard

Michael Deemer

An aqueous solution contains phosphate for producing layers of phosphate on metal surfaces selected from the group consisting of iron, steel, zinc, zinc alloys, aluminum and aluminum alloys. The solution contains 0.3 to 5 g Zn /1, 0.1 to 2 g nitroguanidine/1 and 0.05 to 0.5 g hydroxylamine/l, with an S-value amounting to 0.03 to 0.3 and the ratio of the weight of Zn to P O &equals;1:5 to 1.30.

Aqueous solution and method for phosphatizing metallic surfaces

Disclosed is a process in which a phosphate layer is formed on a metal surface in preparation for the subsequent application of a vitreous enamel coating, wherein a phosphating solution is used which contains essentially nickel and/or cobalt as a layer-forming cation in amounts of 0.5 to 3 g/l as well as

Preparation of metal surfaces for vitreous enameling

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Usingen, Germany

Margit Fleischhacker-Jeworrek