Aluminum member and method of manufacturing aluminum member

Patent metadata

Field	Value
Publication number	US-11549190-B2
Application number	US-202117160220-A
Country	US
Kind code	B2
Filing date	Jan 27, 2021
Priority date	Jul 31, 2018
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

The present disclosure relates to an aluminum member including a mother material containing aluminum or an aluminum alloy, and an anodic oxide film on the surface of the mother material. The anodic oxide film has a barrier layer on the surface of the mother material, and a porous layer on the barrier layer), and the BET specific surface area of the anodic oxide film is 0.1 to 10.0 m 2 /g.

First claim

What is claimed is:

1. An aluminum member comprising:
a mother material containing aluminum or an aluminum alloy; and
an anodic oxide film on a surface of the mother material, wherein
the anodic oxide film has a barrier layer on a surface of the mother material, and a porous layer on the barrier layer, and.
a BET specific surface area of the anodic oxide film is 0.1 to 10.0 m 2 /g,
wherein the porous layer comprises a first pore and second pore,
wherein the first pore extends from a boundary between the porous layer and the barrier layer in a thickness direction of the porous layer,
wherein the second pore communicates with the first pore and extends as to branch radially toward a surface of the porous layer opposite the boundary between the porous layer and the barrier layer, and
wherein the second pore stretches by spreading in an inverted dendroid form along the thickness direction of the porous layer toward the surface of the porous layer.

2. The aluminum member according to claim 1 , wherein a Hunter whiteness of the aluminum member, measured from a surface side of the anodic oxide fin, is 65 or more.

3. A method of manufacturing the aluminum member according to claim 1 , comprising:
a step of preparing a mother material comprising aluminum or an aluminum alloy; and
a step of performing an anodic oxidation treatment on the mother material in an electrolytic solution including: (a) a first acid being an inorganic acid or a salt of the first acid;
and (b) at least one second acid selected from the group consisting of diphosphoric acid, triphosphoric acid, and polyphosphoric acid, or a salt of the second acid.

4. The method of manufacturing the aluminum member according to claim 3 , wherein in the step of performing the anodic oxidation treatment,
a concentration of the first acid or a salt of the first acid in the electrolytic solution is 0.005 to 7.0 mol·dm −3 , and
a concentration of the second acid or a salt of the second acid in the electrolytic solution is 0.005 to 10.0 mol·dm −3 .

5. The method of manufacturing the aluminum member according to claim 3 , wherein in the step of performing the anodic oxidation treatment,
a current density is 2 to 150 mA·cm −2 , and an electrolysis time is 10 to 700 minutes.

6. The aluminum member of claim 1 , wherein a thickness of the anodic oxide film is 100 μm or less.

7. The aluminum member of claim 1 , wherein a thickness of the barrier layer is 10 to 150 nm.

8. The aluminum member of claim 1 , wherein the first pore lies in vicinity of the boundary, and wherein the second pore lies in vicinity of the surface of the porous layer.

9. The aluminum member of claim 1 , wherein a thickness of porous layer is 6 μm or more and less than 100 μm.

10. The aluminum member of claim 1 , wherein the BET specific surface area of the anodic oxide film is 0.1 to 8.0 m 2 /g.

11. The aluminum member of claim 1 , wherein the BET specific surface area of the anodic oxide film is 0.5 to 8.0 m 2 /g.

Assignees

• Uacj Corp

Inventors

• SAITO Syu
• NUNOMURA Junji

Classifications

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title

• C25D9/06 Primary

  by anodic processes · CPC title

• C25D11/08 Primary

  containing inorganic acids · CPC title