C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22.5
C25D 11/24 (2006.01) B05D 7/14 (2006.01) C25D 11/18 (2006.01)
Patent
CA 1123777
LA PA YK--001 SEALING ANODIZED ALUMINUM WITH SILICIC ACID OR SILICATE AND COATING FOR CORROSION RESISTANCE Abstract of the Disclosure A novel and improved method is proposed for providing a coating film with excellent corrosion resistance on the anodically oxidized surface film of aluminum articles, in which the coating procedure with a coating composition is preceded by a treatment for sealing the micropores in the oxide layer of the anodically oxidized aluminum material. The sealing liquid used in the inventive method is an aqueous solution or dispersion containing a silicic acid or a silicate and the sealing treatment is carried out by dipping the aluminum article in the sealing liquid with optional electrolytic application of an electric voltage, Application of an electric voltage to the sealing liquid prior to its use or a secondary sealing treatment in a conventional method following the sealing treatment with the sealing liquid containing a silicic acid or a silicate is also effective in further improvement of the corrosion resistance of the coating. If desired, coloring of the surface can be undertaken prior to the sealing treatment with no adverse effects, - 1 -
299867
Hasegawa Mutsuo
Hayashi Shinji
Hirono Hatsuo
Nagata Katsuyuki
Yamagata Hiroshi
Gowling Lafleur Henderson Llp
Yoshida Kogyo K.k.
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