EP 0907762 A1 19990414 - CHROMATE-FREE CONVERSION LAYER AND PROCESS FOR PRODUCING THE SAME
Title (en)
CHROMATE-FREE CONVERSION LAYER AND PROCESS FOR PRODUCING THE SAME
Title (de)
CHROM(VI)-FREIE KONVERSIONSSCHICHT SOWIE VERFAHREN ZU IHRER HERSTELLUNG
Title (fr)
COUCHE DE CONVERSION EXEMPTE DE CHROME(VI) ET SON PROCEDE DE PRODUCTION
Publication
Application
Priority
- DE 9700800 W 19970418
- DE 19615664 A 19960419
Abstract (en)
[origin: US2003207133A1] A chromium(VI)-free, chromium(III)-containing and substantially coherent conversion layer on zinc or zinc alloys presenting, even in the absence of further components such as silicate, cerium, aluminum and borate, a corrosion protection of approx. 100 to 1000 h in the salt spray test according to DIN 50021 SS or ASTM B 117-73 until first attack according to DIN 50961 Chapter 10; being clear, transparent and substantially colorless and presenting multi-colored iridescence; having a layer thickness of approx. 100 nm to 1000 nm; and being hard, adhering well and being resistant to wiping.
IPC 1-7
IPC 8 full level
B05D 3/10 (2006.01); B05D 7/14 (2006.01); C23C 22/30 (2006.01); C23C 22/53 (2006.01)
CPC (source: EP US)
C23C 22/34 (2013.01 - EP US); C23C 22/53 (2013.01 - EP US); C23C 2222/10 (2013.01 - EP US); Y10T 428/12583 (2015.01 - EP US); Y10T 428/1259 (2015.01 - EP US); Y10T 428/12611 (2015.01 - EP US); Y10T 428/12792 (2015.01 - EP US); Y10T 428/12799 (2015.01 - EP US)
Citation (search report)
See references of WO 9740208A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 2003207133 A1 20031106; US 6946201 B2 20050920; AT E207135 T1 20011115; AU 3087397 A 19971112; BR 9710954 A 20040824; DE 19615664 A1 19971023; DE 59704982 D1 20011122; DK 0907762 T3 20020107; EP 0907762 A1 19990414; EP 0907762 B1 20011017; ES 2163776 T3 20020201; JP 2000509434 A 20000725; JP 2004003019 A 20040108; JP 3597542 B2 20041208; JP 4493930 B2 20100630; PT 907762 E 20020429; US 6287704 B1 20010911; WO 9740208 A1 19971030
DOCDB simple family (application)
US 90499301 A 20010713; AT 97925823 T 19970418; AU 3087397 A 19970418; BR 9710954 A 19970418; DE 19615664 A 19960419; DE 59704982 T 19970418; DE 9700800 W 19970418; DK 97925823 T 19970418; EP 97925823 A 19970418; ES 97925823 T 19970418; JP 2003129149 A 20030507; JP 53759697 A 19970418; PT 97925823 T 19970418; US 17155899 A 19990329