EP 1200641 B1 20031217 - PRETREATMENT OF ALUMINUM SURFACES WITH CHROME-FREE SOLUTIONS
Title (en)
PRETREATMENT OF ALUMINUM SURFACES WITH CHROME-FREE SOLUTIONS
Title (de)
VORBEHANDLUNG VON ALUMINIUMOBERFLÄCHEN DURCH CHROMFREIE LÖSUNGEN
Title (fr)
TRAITEMENT PREALABLE DE SURFACES D'ALUMINIUM A L'AIDE DE SOLUTIONS EXEMPTES DE CHROME
Publication
Application
Priority
- DE 19921842 A 19990511
- EP 0003900 W 20000429
Abstract (en)
[origin: US6562148B1] In a method for the pretreatment of work pieces having a surface made of aluminium or aluminium alloys, for non-cutting shaping and/or the connection by welding or gluing to work pieces as well as for a subsequent permanent corrosion-preventing treatment, the work pieces are subjected to a three-stage treatment bya) rinsing with an aqueous, acidic solution containing a mineral acid,b) rinsing with water,c) bringing them into contact with an aqueous, acidic solution which is chromium-free and polymer-free and contains Ti and Zr as complex fluorides in a weight ratio of Ti:Zr of 2:1 to 1:2, in such a way that, after the subsequent drying off, a layer weight of 2 to 15 mg/m2 (calculated as Ti/Zr metal) results, wherein depending on the type of application, solutions having different concentrations and different pH values are used.
IPC 1-7
IPC 8 full level
C23C 22/34 (2006.01)
CPC (source: EP US)
C23C 22/34 (2013.01 - EP US); C23G 1/125 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 6562148 B1 20030513; AR 023943 A1 20020904; AT E256765 T1 20040115; AU 4403400 A 20001121; CA 2373089 A1 20001116; DE 19921842 A1 20001116; DE 50004805 D1 20040129; EP 1200641 A1 20020502; EP 1200641 B1 20031217; ES 2213012 T3 20040816; NO 20015445 D0 20011107; NO 20015445 L 20011107; WO 0068458 A1 20001116
DOCDB simple family (application)
US 1816502 A 20020123; AR P000102248 A 20000510; AT 00925252 T 20000429; AU 4403400 A 20000429; CA 2373089 A 20000429; DE 19921842 A 19990511; DE 50004805 T 20000429; EP 0003900 W 20000429; EP 00925252 A 20000429; ES 00925252 T 20000429; NO 20015445 A 20011107