Process for sealing anodized aluminum

Details Process for sealing anodized aluminum Process for sealing anodized aluminum

C - Chemistry, Metallurgy

25

D

204/21.5

C25D 11/18 (2006.01) C25D 11/24 (2006.01)

Patent

CA 1338442

In the process of sealing decorative anodized aluminum oxide coatings in hot aqueous solutions, superior results are obtained when the sealing solutions contain 1-phosphonopropane-1,2,3-tricarboxylic acid, 1,1-diphosphonopropane-2,3-dicarboxylic acid, and/or alkali metal and/or alkanolamine salts of these acids. The presence of these acids or their salts prevents the formation of bloom and allows shorter sealing times with equivalent quality, and the addition of as little as 1 ppm of aluminum ions to such solutions also prevents iridescence.

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