Method of sealing oxidized aluminum surfaces with aqueous...

Details Method of sealing oxidized aluminum surfaces with aqueous... Method of sealing oxidized aluminum surfaces with aqueous...

C - Chemistry, Metallurgy

25

D

204/21.5

C25D 11/24 (2006.01)

Patent

CA 1105872

ABSTRACT OF THE DISCLOSURE In the process of treating an aluminum or aluminum alloy surface which comprises anodically oidizing the surface and subsequently sealing the surface, the improvement consisting of sealing in an aqueous solution at a temperature between 90°C and the boiling temperature of the solution, said aqueous solu- tion having a pH value of from 4 to 8 and containing from 0.0005 to 0.2 gm per liter of cycloaliphatic or aromatic polycarboxylic acid or water-soluble salt thereof, said cycloaliphatic or aromatic polycarboxylic acid having 4 to 6 carboxyl groups.

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