Henkel Kommanditgesellschaft Auf Aktien

Henkel Kgaa

Harald Wennemann

Dieter Brodalla

Frantisek Jost

Winfried Kirchhoff

Herbert Leiter

Uwe Karmaschek

Jurgen Lindener

Achim Roland

Andreas Buhl

Hubert Vennschott

Hans J Gohausen

Chromium-free conversion coating treatment of aluminum

Liquid phosphate-free single phase degreasing compositions for aluminum surfaces containing one or more builders, sequestrants and surfactants in aqueous alkaline solution, particularly containing alkali metal and/or ammonium carbonate, alkali metal and/or ammonium hydrogen carbonate, one or more acrylic polymers, optionally one or more other complexing agents which complement or partly replace the acrylic polymers, one or more anionic or nonionic surfactants, optionally other active substances and/or auxiliaries of the type normally used in degreasing compositions and water.

Liquid, phosphate-free single phase degreasing compositions

A process for sealing anodically produced oxide layers on aluminum and aluminum alloys by treating them with an aqueous solution at a temperature between about 90.degree. C. and its boiling point, wherein the aqueous solution has a pH of from about 4 to about 8 and and contains from about 0.0005 to about 0.5 g/l of at least one phosphinocarboxylic acid or its water-soluble salt.

Sealing anodically produced oxide layers, on aluminum

Growing community of inventors

Erkrath, Germany

Harald Wennemann