Chemetall Gmbh

Peter Claude

Eckart Schonfelder

Carola Komp

Joachim Geldner

Franz Dressler

Stella Bauerochse

Zafer Yuksel

Ralph Van Den Berg

Juergen Specht

Peter Schubach

Rüdiger Rein

Jürgen Specht

Eckart Schönfelder

Ralph Berg Van Den

Ruediger Rein

Zafer Yüksel

The demulsifying cleaning of metallic surfaces which may be contaminated with oil(s) with at least one further nonpolar organic compound, with fat(s), with soap(s), with particulate dirt or with at least one anionic organic compound using an aqueous, alkaline, surfactant-containing bath solutions.

Process for the demulsifying cleaning of metallic surfaces

A method for treating or pre-treating parts, profiled-pieces, strips, sheet metals or wires having metallic surfaces, in which at least 5% of these surfaces consists of aluminum or of at least one aluminum alloy with an acid aqueous solution which contains fluoride, zinc and phosphate and which has the following dissolved contents in the phosphatizing solution: sodium virtually none, from 0.04 to less than 2 g/L; potassium virtually none or in a concentration ranging from 0.025 to 2.5 g/L; sodium and potassium in a concentration ranging from 0.025 to 2.5 g/L as sodium, whereby the potassium content is converted to sodium on a molar basis; zinc 0.2 to 4 g/L zinc, 5 to 65 g/L calculated as PO; 0.03 to 0.5 g/L phosphate free fluoride wherein the total fluoride is present in a concentration ranging from 0.1 to 5 g/L. A zinc-containing phosphate layer is thereby deposited onto the metallic surfaces with a layer weight ranging from 0.5 to 10 g/m.

Process for coating metallic surfaces

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Bad Vilbel, Germany

Peter Claude