C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/40 (2006.01) C23C 16/06 (2006.01) C23C 22/56 (2006.01) C23C 22/66 (2006.01) C23C 22/73 (2006.01)
Patent
CA 2364964
The present invention relates to a compound, non-chromium conversion coating for a part formed from an aluminum alloy. The coating is formed by providing a first solution containing an anodic inhibitor species, providing a second solution containing a cathodic corrosion inhibitor species, and immersing the part to be coated in a first one of the first and second solutions and thereafter in a second one of the first and second solutions. Suitable anodic inhibitor species include tungstates; permanganates, vanadates, molybdates, and mixtures thereof. Suitable cathodic corrosion inhibitors include cobalt, cerium, other lanthanide elements, and mixtures thereof. In one embodiment, the conversion coating is formed using a cerium containing solution and a tungstate containing solution.
Jaworowski Mark R.
Kryzman Michael A.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
United Technologies Corporation
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