EP 0754251 B1 19980520 - CHROME-FREE PROCESS FOR THE NO-RINSE TREATMENT OF ALUMINIUM AND ITS ALLOYS, PLUS SOLUTIONS SUITABLE FOR USE IN THE PROCESS
Title (en)
CHROME-FREE PROCESS FOR THE NO-RINSE TREATMENT OF ALUMINIUM AND ITS ALLOYS, PLUS SOLUTIONS SUITABLE FOR USE IN THE PROCESS
Title (de)
CHROMFREIES VERFAHREN ZUR NO-RINSE BEHANDLUNG VON ALUMINIUM UND SEINEN LEGIERUNGEN SOWIE HIERFÜR GEEIGNETE WÄSSRIGE BADLÖSUNGEN
Title (fr)
PROCEDE SANS CHROME DE TRAITEMENT SANS RINCAGE DE L'ALUMINIUM ET DE SES ALLIAGES ET SOLUTIONS AQUEUSES APPROPRIEES
Publication
Application
Priority
- DE 4412138 A 19940408
- EP 9501197 W 19950331
Abstract (en)
[origin: DE4412138A1] Described is a process using a no-rinse technique for the production of a chrome-free conversion layer on the surface of aluminium and its alloys by treating with an aqueous solution having a pH between 1 and 3.5 and containing titanium and/or zirconium plus an organic film-forming agent. The process is characterized in that the surface is brought into contact with a solution containing a) 2.2 to 22.0 g/l of Zr(IV) and/or 1.4 to 14.0 g/l of Ti(IV), b) 2.4 to 24.0 g/l of orthophosphate, c) 3.0 to 30.0 g/l of fluoride, d) 0.15 to 1.5 g/l of an organic film-forming agent which is soluble in or forms a homogeneous dispersion with water and, after a contact time between 1 and 40 seconds, the wet surface is allowed to dry off, without rinsing, at a temperature between 50 and 125 DEG C. Also described are aqueous concentrates for use in the process.
IPC 1-7
IPC 8 full level
C23C 22/36 (2006.01)
CPC (source: EP US)
C23C 22/361 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
DE 4412138 A1 19951012; CA 2187463 A1 19951019; DE 59502263 D1 19980625; EP 0754251 A1 19970122; EP 0754251 B1 19980520; ES 2117863 T3 19980816; JP 3662586 B2 20050622; JP H09511548 A 19971118; US 5868872 A 19990209; WO 9527807 A1 19951019
DOCDB simple family (application)
DE 4412138 A 19940408; CA 2187463 A 19950331; DE 59502263 T 19950331; EP 9501197 W 19950331; EP 95915174 A 19950331; ES 95915174 T 19950331; JP 52604995 A 19950331; US 72226196 A 19961025