Processes for sealing anodised aluminium

Details Processes for sealing anodised aluminium Processes for sealing anodised aluminium

C - Chemistry, Metallurgy

25

D

6/221, 6/222, 20

C25D 11/24 (2006.01)

Patent

CA 1251416

- 25 - A B S T R A C T Processes for sealing anodised aluminium carried out in a bath having a pH of at least 7 and in the presence of a smut- inhibiting additive have been discovered to give rapid, efficient sealing without the formation of bloom. Examples of smut-inhibiting additives are phosphonates, benzene, hexacarboxylic acid and the reaction products of an aldehyde or dimethylol urea with sulphonated aromatic compounds. The reduction in time required for sealing reduces energy consumption in the anodising operation.

451431

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