Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1993-09-13
1994-08-02
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
205173, C25D 1304
Patent
active
053342976
ABSTRACT:
A fast and brightly colored oxide film of aluminum which excels in durability and allows no separation of pigment is produced by using an aqueous dispersion of an organic pigment or carbon black finely divided to a size in the range between 3 and 150 nm, forming on a surface of an aluminum member an anodic oxide film containing pores larger in diameter than the ordinary pores, and causing the organic pigment or carbon black to migrate and deposit in the pores of the oxide film by means of electrophoresis. The formation of the anodic oxide film containing the pores larger in diameter than the ordinary pores is accomplished in the first method by subjecting the aluminum member to anodic oxidation at a high voltage in an aqueous solution of acid. In the second method, the anodic oxide film is subjected either to a treatment of immersion in an aqueous solution of at least one acid selected from among phosphoric acid, sulfuric acid, oxalic acid, and sulfamic acid or to a combination treatment of immersion and AC electrolysis repeated in a prescribed number of cycles in the solution, to enlarge the pores in the anodic oxide film.
REFERENCES:
patent: 3622473 (1971-11-01), Ohta et al.
patent: 3718548 (1973-02-01), Paulet et al.
patent: 3844908 (1974-10-01), Matsuo et al.
patent: 4221640 (1980-09-01), Shibata et al.
patent: 4310586 (1982-01-01), Sheasby et al.
patent: 5237618 (1993-08-01), Bethel
Fukui Hideo
Hirono Hatsuo
Ito Seishiro
Nakada Norio
Mayekar Kishor
Niebling John
Yoshida Kogyo K.K.
LandOfFree
Method for production of colored article of aluminum or aluminum does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for production of colored article of aluminum or aluminum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for production of colored article of aluminum or aluminum will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-63335