Back to results
US 2010/0147802 A1Published application
Methods and removers for removing anodized films
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsKatsuyuki Iijima, Tetsuo Suzuki
Life of this patent
Estimating the term…
Abstract
A remover contains an alkaline component, a bivalent zinc ion, a ferric ion, a chelating agent, and a nitrate ion. By using this remover, an anodized film can be selectively removed from an aluminum or aluminum-alloy member.
Claims21
1-14. (canceled)
A method for removing an anodized film from an aluminum or aluminum-alloy member, comprising:
- immersing the anodized aluminum or aluminum-alloy member in a remover for removing the anodized film, wherein the remover comprises:
- (1) an alkaline component,
- (2) a bivalent zinc ion,
- (3) a ferric ion,
- (4) a chelating agent, and
- (5) a nitrate ion;
- and subsequently immersing the member in a 100 g/l to 360 g/l aqueous nitric acid solution containing 2 g/l to 24 g/l of a fluorine ion.
4 more elements
A method for removing an anodized film, comprising:
- immersing an anodized aluminum or aluminum-alloy member in a remover comprising:
- (A) a component for dissolving an anodized film, and
- (B) a component for forming another film on the surface of the aluminum or aluminum alloy;
- whereby the anodized film is removed from the member and another film is formed on the member;
- and removing said another film from the member.
2 more elements
A method for removing an anodized film, comprising:
- immersing an anodized aluminum or aluminum-alloy member in the remover for removing an anodized film, wherein the remover comprises:
- (1) an alkaline component,
- (2) a bivalent zinc ion,
- (3) a ferric ion,
- (4) a chelating agent, and
- (5) a nitrate ion;
- subsequently immersing the member in a 100 g/l to 360 g/l aqueous nitric acid solution containing 2 g/l to 24 g/l of a fluorine ion;
- bringing fine hard particles into collision with the surface of the member;
- and
- subsequently immersing the member in an etching solution.
7 more elements
A method for removing an anodized film, comprising:
- immersing an anodized aluminum or aluminum-alloy member in the remover for removing an anodized film from an aluminum or aluminum-alloy member, consisting essentially of:
- (1) 10 g/l to 100 g/l of an alkaline component in terms of hydroxide ion concentration;
- (2) 2 g/l to 20 g/l of a bivalent zinc ion,
- (3) 0.1 g/l to 1 g/l of a ferric ion,
- (4) a chelating agent in a concentration sufficient to prevent the formation of iron hydroxide, and
- (5) 0.3 g/l to 3 g/l of a nitrate ion;
- and subsequently immersing the member in a 100 g/l to 360 g/l aqueous nitric acid solution containing 2 g/l to 24 g/l of a fluorine ion.
4 more elements
Dependencies are inferred from the claim text.