Aluminum member and method of manufacturing aluminum member

Patent metadata

Field	Value
Publication number	US-12173421-B2
Application number	US-202117382224-A
Country	US
Kind code	B2
Filing date	Jul 21, 2021
Priority date	Jan 23, 2019
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

Provided is an aluminum member including a base material containing aluminum or an aluminum alloy and an anodic oxide film having a barrier layer on the surface of the base material and a porous layer on the barrier layer, in which the anodic oxide film has a thickness of 100 μm or less, the porous layer contains S and P, the concentration of S, C S , and the concentration of P, C P , in the porous layer, measured by X-ray photoelectron spectroscopy, satisfy C S >C P over the depth direction from the surface of the anodic oxide film toward the base material.

First claim

What is claimed is:

1. An aluminum member comprising:
a base material containing aluminum or an aluminum alloy; and
an anodic oxide film having a barrier layer on a surface of the base material and a porous layer on the barrier layer, wherein
the anodic oxide film has a thickness of 100 μm or less,
the porous layer contains S and P, and a concentration of S, C S , and a concentration of P, C P , in the porous layer, measured by X-ray photoelectron spectroscopy, satisfy C S >C P ,
first pores extending perpendicularly to a surface of the barrier layer lie on a barrier layer side of the porous layer,
second pores lie on a surface side of the porous layer and extend in a thickness direction of the porous layer in such a way as to branch radially toward a surface of the porous layer, and
the second pores communicate with the first pores.

2. The aluminum member according to claim 1 , wherein when in a depth direction from a surface of the anodic oxide film toward the base material, a region having a depth greater than 500 nm from a surface of the porous layer is defined as S1, and a region having a depth of 500 nm or less from the surface of the porous layer is defined as S2,
an existing amount of a sulfide based on 2p orbital electrons in the region S1 measured by X-ray photoelectron spectroscopy, S1(2p), and an existing amount of the sulfid based on 2p orbital electrons in the region S2 measured by X-ray photoelectron spectroscopy, S2(2p), satisfy a relationship of
S 1(2 p )/ S 2(2 p )=0.5 to 100.

3. The aluminum member according to claim 1 , wherein a peak of a spectrum based on 2p orbital electrons of S in a binding energy of 155 to 165 eV measured by X-ray photoelectron spectroscopy, exists in the porous layer in a range of a depth of 0.50 to 100 μm from a surface of the porous layer in a depth direction from a surface of the anodic oxide film toward the base material.

4. The aluminum member according to claim 1 , wherein the porous layer comprises a pore having a wall surface that makes an acute angle with the surface of the base material.

5. The aluminum member according to claim 1 , wherein a Hunter whiteness measured from a surface side of the anodic oxide film is 60 to 90.

6. A method of manufacturing the aluminum member according to claim 1 , comprising:
preparing a base material containing aluminum or an aluminum alloy; and
performing an anodic oxidation treatment on the base material in an electrolytic solution containing (a) a first acid containing S 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.

7. The method of manufacturing the aluminum member according to claim 6 , wherein in performing the anodic oxidation treatment,
a concentration of the first acid or the salt of the first acid in the electrolytic solution is 0.01 to 2.0 mol·dm −3 , and
a concentration of the second acid or the salt of the second acid in the electrolytic solution is 0.01 to 5.0 mol·dm −3 .

8. The method of manufacturing the aluminum member according to claim 6 , wherein in performing the anodic oxidation treatment,
the anodic oxidation treatment is performed under conditions of a current density of 5 to 30 mA·cm −2 and an electrolysis time of 10 to 600 minutes.

Assignees

• Uacj Corp
• Uaci Corp

Inventors

• NUNOMURA Junji

Classifications

• C25D11/08 Primary

  containing inorganic acids · CPC title

• C25D11/06

  characterised by the electrolytes used · CPC title

• C25D11/16

  Pretreatment {, e.g. desmutting} · CPC title

• C25D11/14

  Producing integrally coloured layers · CPC title

• C25D11/04 Primary

  of aluminium or alloys based thereon · CPC title