EP 0112826 A4 19841107 - ALKALINE RESISTANT PHOSPHATE CONVERSION COATINGS AND METHOD OF MAKING.
Title (en)
ALKALINE RESISTANT PHOSPHATE CONVERSION COATINGS AND METHOD OF MAKING.
Title (de)
ALKALIBESTÄNDIGE PHOSPHATUMWANDLUNGSSCHICHTEN UND DEREN HERSTELLUNGSVERFAHREN.
Title (fr)
REVETEMENTS DE CONVERSION DE PHOSPHATE DE RESISTANCE ALCALINE ET PROCEDE DE FABRICATION.
Publication
Application
Priority
US 8200949 W 19820712
Abstract (en)
[origin: WO8400386A1] A method for increasing the resistance to alkaline dissolution of a phosphate conversion coating on a corrodible metal substrate. The substrate is exposed to the phosphating solution by spraying or dipping to chemically effect a reaction with the substrate. The solution contains 84-94 molar percent of the total metal cations of a first layer-forming divalent metal cation, the metal cation having a hydroxide which has a lower solubility in an alkaline solution than iron or zinc hydroxide and is preferably selected from the group consisting of nickel, cobalt, magnesium and lanthanides, and a second layer-forming metal cation in the form of zinc present in an amount of .2-.6 g/l as a Zn<+2>. The molar ratio range of the first and second metal cations is in the range of 5.2:1 to 16:1, and the first metal cation is present in the solution in an amount of at least 1.0 g/l. The deposited coating has a first divalent metal cation present in an amount of at least 15 mole percent of the total divalent cations, and a second divalent cation present in an amount of at least 25 % by weight of the coating; the coating preferably has a uniform weight of less than 1.3 g/m<2> (120 mg/ft<2>).
IPC 1-7
IPC 8 full level
C23C 22/18 (2006.01); C23C 22/07 (2006.01); C23C 22/12 (2006.01); C23C 22/22 (2006.01); C23C 22/36 (2006.01)
CPC (source: EP)
C23C 22/12 (2013.01); C23C 22/362 (2013.01)
Citation (search report)
- [X] FR 2065066 A5 19710723 - LUBRIZOL CORP
- [A] US 2790740 A 19570430 - AYRES ROBERT F, et al
- [A] FR 1451329 A 19660107 - PARKER STE CONTINENTALE
- [A] FR 1554024 A 19690117
Designated contracting state (EPC)
BE CH DE FR GB LI LU NL SE
DOCDB simple family (publication)
WO 8400386 A1 19840202; AU 569697 B2 19880218; AU 8826782 A 19840208; BR 8208086 A 19840717; DE 3279307 D1 19890202; DK 104684 A 19840312; DK 104684 D0 19840227; EP 0112826 A1 19840711; EP 0112826 A4 19841107; EP 0112826 B1 19881228; JP H0419307 B2 19920330; JP S59501269 A 19840719; NO 840917 L 19840309
DOCDB simple family (application)
US 8200949 W 19820712; AU 8826782 A 19820712; BR 8208086 A 19820712; DE 3279307 T 19820712; DK 104684 A 19840227; EP 82902566 A 19820712; JP 50260682 A 19820712; NO 840917 A 19840309