Patent ID: 6506263
Filing Date: 2003-01-14
Classification: C25D

Abstract:
A method of sealing an anodically oxidized aluminum article, comprising contacting an anodically oxidized aluminum article with an aqueous bath comprising:a. at least one surfactant of the formula: wherein Y is a direct bond or a group of the formula: wherein R1 and R2 are each individually selected from H or C5-C22 alkyl, with the proviso that R1 and R2 may not both be H; n has a value in the range of 1 to 4; and X is a counter-ion or an alkali metal ion; b. a magnesium salt, wherein the amount of magnesium ion is effective to achieve a seal; c. a cobalt(II) salt, wherein the amount of cobalt(II) salt is effective to potentiate the sealing effect of said magnesium ion, said potentiating amount of cobalt(II) ranging from about 10 to 300 ppm; and d. water; to form a sealed anodically aluminum surface, wherein said anodically oxidized aluminum surface exhibits improved resistance to stains and corrosive substances.