Henkel Kommanditgesellschaft Auf Aktien

Helmut Endres

Jan-Willem Brouwer

Peter Christophliemk

Winfried Wichelhaus

Wolf-Achim Roland

Karl-Dieter Brands

Peter Wedl

Horst-Dieter Speckmann

Kurt Worschech

Karl-Heinz Gottwald

Frido Loeffelholz

Guenther Geismar

Angela Hansen

Herbert Fischer

Horst Upadek

Peter Kuhm

Klaus Hornfeck

Joerg Riesop

Maria Liphard

Bernd Schenzle

Andreas Arnold

Guenter Geismar

A process for pretreating surfaces made from steel, galvanised steel and/or aluminum and/or alloys thereof, wherein, in a first process stage, phosphating is performed using a low-nickel zinc phosphating solution; in a second process stage, the phosphated surfaces are post-rinsed using an aqueous solution which contains 0.001 to 10 g/l of lithium ions; copper ions and/or silver ions; and, in a third process stage, a low-lead cathodically depositable electrocoating lacquer is applied which contains no more than 0.05 wt. % of lead, relative to the dry solids content of the lacquer.

Process for phosphatizing, rerinsing and cathodic electro-dipcoating

A process for phosphating metal surfaces in which a nitrite- and nickel-free zinc-containing phosphating solution is applied to the metal surfaces which, if desired, are then rinsed and subsequently after-rinsed with an aqueous solution with a pH value of 3 to 7 which contains 0.001 to 10 g/l of one or more of the cations of Li, Cu and Ag.

Phosphating process with a metalliferous re-rinsing stage

Phosphating process with a copper-containing re-rinsing stage

Cationic layer compounds modified with polymers

Cationic modified layer compounds

Process for regenerating wastepaper using a double layer hydroxide

Use of cationic non-silicate layer compounds in detergents

Effective, titanium-free agents for activating metal surfaces prior to phosphating these surfaces with phosphating baths containing zinc ions can be made by reacting alkali metal phosphates with 1,1-diphosphonic acids and their alkali metal slats and/or poly(aldehydocarboxylic acids) and their alkali metal salts.

Titanium free composition and process for activating metal surfaces

Effective, titanium-free agents for activating metal surfaces prior to phosphating these surfaces with phosphating baths containing zinc ions can be made by reacting alkali metal phosphates with 1,1-diphosphonic acids and their alkali metal salts and/or poly(aldehydocarboxylic acids) and their alkali metal salts.

Activation of metal surfaces prior to phosphating can be improved by using aqueous dispersions of polymeric titanium(IV) phosphates in which at least 95% by weight of the polymeric particles have a particle diameter of less than 200 nm. This low particle diameter is attained by adding a titanium(IV)-complexing agent before or during an otherwise conventional reaction between a titanium(IV) compound, acid or phosphate, and water. The complexing agent is used in an amount of less than the stoichiometric amount, based on the titanium(IV) content. The best complexing agents are poly(aldehydocarboxylic acids), 1,1-diphosphonic acids, and/or the alkali metal salts of these types of acids.

Composition and process for activating metal surfaces prior to zinc

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Langenfeld, Germany

Helmut Endres