C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/20
C23C 22/30 (2006.01) C23C 22/34 (2006.01) C23C 22/37 (2006.01)
Patent
CA 1286957
ABSTRACT An aqueous acidic trivalent chromium and fluoride containing coating (passivating) solution for zinc, zinc alloy and cadmium surfaces contains one or more complex compounds of the formula [Cr(H2O)6-xFx](3-x)+A- wherein x is an integer of from 1 to 3 and A is an anion of the group selected from nitrate, sulfate, phosphate, chloride, bromide, fluoride and iodide. In particular the solution contains a soluble nitrate in an amount greater than the cromium(III)concentration and before application the solution is either heated to at least 60°C or treated with a catalyst at a temperature above 15°C.
522217
Birnstiel Willi
Klos Klaus-Peter
Lindemann Karl-Heinz
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Surtec Gmbh
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