EP 0044171 A1 19820120 - Method of producing conversion coatings.
Title (en)
Method of producing conversion coatings.
Title (de)
Verfahren zur Herstellung von Umwandlungsüberzügen.
Title (fr)
Procédé pour la fabrication de couches de conversion.
Publication
Application
Priority
- GB 8021568 A 19800701
- GB 8103452 A 19810204
Abstract (en)
Conversion coatings of the hydrated metal oxide type are deposited on a substrate of Al, Mg, Sn or Zn or their alloys, from an aqueous solution of Al<III> having a pH of 1.5 to 5.5 and containing NO3<->. The coating produced is of hydrated aluminium oxide. Conversion coatings having further enhanced corrosion resistance are produced from solutions which include borate and have pH's in the range of 4 to 5.5
IPC 1-7
IPC 8 full level
C23C 22/56 (2006.01); C23C 22/34 (2006.01); C23C 22/48 (2006.01)
CPC (source: EP)
C23C 22/34 (2013.01); C23C 22/48 (2013.01)
Citation (search report)
- US 3964936 A 19760622 - DAS NARAYAN
- GB 1218678 A 19710106 - KAWASAKI STEEL CO [JP]
- DE 3031270 A1 19810319 - RICHARDSON CHEMICAL CO
- FR 2465008 A1 19810320 - RICHARDSON CHEMICAL CO [US]
- GB 2059445 A 19810423 - RICHARDSON CHEMICAL CO
- US 2032897 A 19360303 - TANNER ROBERT R
- GB 625041 A 19490621 - RENE GIDE
- FR 794904 A 19360228 - PARKER STE CONTINENTALE
- US 2327002 A 19430817 - THOMPSON JOHN S
- FR 2219245 A1 19740920 - PARKER STE CONTINENTALE [FR]
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0044171 A1 19820120; AU 7320181 A 19820202; DK 85182 A 19820226; ES 503554 A0 19820401; ES 8203984 A1 19820401; JP S57501532 A 19820826; NO 820627 L 19820301; WO 8200160 A1 19820121
DOCDB simple family (application)
EP 81302990 A 19810701; AU 7320181 A 19810701; DK 85182 A 19820226; ES 503554 A 19810630; GB 8100119 W 19810701; JP 50222781 A 19810701; NO 820627 A 19820301