EP 0034040 A1 19810819 - Method of producing conversion coatings.
Title (en)
Method of producing conversion coatings.
Title (de)
Verfahren zur Herstellung von Konversionsschichten.
Title (fr)
Procédé pour former des couches de conversion.
Publication
Application
Priority
- GB 8004039 A 19800206
- GB 8021569 A 19800701
Abstract (en)
Corrosion resistant conversion coatings can be deposited on a metal, especially, zinc, tin, cadmium, iron, steel, magnesium, copper, nickel, silver or aluminium or their alloys, substrate by contacting the substrate with an aqueous solution containing Fe<II>, Fe<III>, Ni<II> or especially Cr<III> ions and an oxidizing agent. The solution is either dilute, less than 0.1 M, in respect of the ions and/or contains a weak complexing agent for the ions. Especially good corrosion resistance notably on Zn e.g. galvanized steel, substrates is obtained by including boric acid in the solution. The coatings are preferably baked to age them and may subsequently be lacquered, painted or laminated to plastics materials.
IPC 1-7
IPC 8 full level
C23F 11/00 (2006.01); C23C 22/34 (2006.01); C23C 22/48 (2006.01); C23C 22/53 (2006.01); C23F 11/18 (2006.01)
CPC (source: EP)
C23C 22/34 (2013.01); C23C 22/48 (2013.01); C23C 22/53 (2013.01); C23C 2222/10 (2013.01)
Citation (search report)
US 3468724 A 19690923 - REINHOLD EARL R
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0034040 A1 19810819; DK 440881 A 19811005; JP S57500248 A 19820212; NO 813368 L 19811005; WO 8102311 A1 19810820
DOCDB simple family (application)
EP 81300467 A 19810204; DK 440881 A 19811005; GB 8100012 W 19810204; JP 50053181 A 19810204; NO 813368 A 19811005