A method for preventing coatings by after-sealing of anodically oxidized surfaces of aluminum or aluminum alloys.

摘要

1368336 Sealing of anodized aluminium HENKEL & CIE GmbH 17 Dec 1971 [19 Dec 1970] 58611/71 Heading C7B Anodized aluminium or aluminium alloy e.g. Al-Mg or Al-Mg-Si is sealed using a solution containing a) an amine, hydrazine, a compound obtained by the reaction of an aldehyde or ketone with a primary amine, ammonia, or a salt there of and b) a dextrin and/or (meth)acrylic acid or polymerisate thereof, or salt thereof and/or ligninsulphonic acid, or salt thereof, at a temperature of 90‹C-BP; sealing taking place without producing coating of the anodized surface.