Aluminum member and method of manufacturing aluminum member

Patent metadata

Field	Value
Publication number	US-2021285120-A1
Application number	US-202117332779-A
Country	US
Kind code	A1
Filing date	May 27, 2021
Priority date	Nov 30, 2018
Publication date	Sep 16, 2021
Grant date	—

Abstract

The aluminum member of the present disclosure includes a mother material containing aluminum or an aluminum alloy, and an anodic oxide film on the surface of the mother material, in which the arithmetical mean roughness Ra, the mean length of roughness curve elements RSm, and the Hunter whiteness of the aluminum member, measured from the surface side of the anodic oxide film, are 0.1 μm or more, 10 μm or less, and 60 to 90, respectively.

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 an arithmetical mean roughness Ra, a mean length of roughness curve elements RSm, and a Hunter whiteness of the aluminum member, measured from a surface side of the anodic oxide film, are 0.1 μm or more, 10 μm or less, and 60 to 90, respectively.

2 . The aluminum member according to claim 1 , wherein a relational expression between the arithmetical mean roughness Ra and the mean length of roughness curve elements RSm satisfies 0.1≤Ra/RSm≤1.2, and the Hunter whiteness of the aluminum member, measured from the surface side of the anodic oxide film, is 70 to 90.

3 . A method of manufacturing an aluminum member, comprising:
a step of preparing a mother material containing 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 selected from the group consisting of an inorganic acid and an organic carboxylic acid or a salt of the first acid; and (b) a second acid being an acid anhydride, wherein a concentration of the first acid or a salt of the first acid is 0.01 to 2.0 mol·dm −3 , and a concentration of the second acid is 0.01 to 5.0 mol·dm −3 .

4 . The method of manufacturing the aluminum member according to claim 3 , wherein a current density is 5 to 30 mA·cm −2 in the step of performing the anodic oxidation treatment.

5 . The method of manufacturing the aluminum member according to claim 3 , wherein a temperature of the electrolytic solution is 0 to 80° C. in the step of performing the anodic oxidation treatment.

6 . The method of manufacturing the aluminum member according to claim 4 , wherein a temperature of the electrolytic solution is 0 to 80° C. in the step of performing the anodic oxidation treatment.

7 . The method of manufacturing the aluminum member according to claim 3 , wherein an electrolysis time is 10 to 600 minutes in the step of performing the anodic oxidation treatment.

8 . The method of manufacturing the aluminum member according to claim 4 , wherein an electrolysis time is 10 to 600 minutes in the step of performing the anodic oxidation treatment.

9 . The method of manufacturing the aluminum member according to claim 5 , wherein an electrolysis time is 10 to 600 minutes in the step of performing the anodic oxidation treatment.

10 . The method of manufacturing the aluminum member according to claim 6 , wherein an electrolysis time is 10 to 600 minutes in the step of performing the anodic oxidation treatment.

Assignees

• Uacj Corp

Inventors

• Fukatsu Akihiro
• NUNOMURA Junji

Classifications

• C25D11/10

  containing organic acids · CPC title

• C25D11/06 Primary

  characterised by the electrolytes used · CPC title

• C25D11/04

  of aluminium or alloys based thereon · CPC title

• C25D11/08 Primary

  containing inorganic acids · CPC title

• C25D11/16

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