Aluminum member and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2019161881-A1
Application number	US-201816201969-A
Country	US
Kind code	A1
Filing date	Nov 27, 2018
Priority date	Nov 28, 2017
Publication date	May 30, 2019
Grant date	—

Abstract

An aluminum member comprises a base material made of aluminum or art aluminum alloy, and an anodized coating provided on a surface of the base material and having a thickness of 100 μm or less. The anodized coating comprises a barrier layer formed on the surface of the base material and having a thickness of 10 to 150 nm, and a porous layer formed on the barrier layer and having a thickness of 6 μm or more. The porous layer comprises a first pore extending in a thickness direction of the porous layer from a boundary between the porous layer and the barrier layer, and a second pore connected to the first pore and extending so as to branch radially in the thickness direction of the porous layer toward a surface of the porous layer.

First claim

What is claimed is:

1 . An aluminum member comprising:
a base material made of aluminum or an aluminum alloy; and an anodized coating provided on a surface of the base material and having a thickness of 100 μm or less, wherein the anodized coating comprises a barrier layer formed on the surface of the base material and having a thickness of 10 to 150 nm, and a porous layer formed on the barrier layer and having a thickness of 6 μm or more, and the porous layer comprises a first pore extending in a thickness direction of the porous layer from a boundary between the porous layer and the barrier layer; and a second pore connected to the first pore and extending so as to branch radially in the thickness direction of the porous layer toward a surface of the porous layer.

2 . The aluminum member according to claim 1 , wherein an angle of the second pore with the surface of the base material is 30 to 85 degrees.

3 . The aluminum member according to claim 1 , wherein a brightness by Hunter of the aluminum member, as measured from a surface of the anodized coating, is 70 to 90.

4 . The aluminum member according to claim 1 , wherein an average diameter of the first pore is 10 to 150 nm, and an average spacing between the first pores adjacent to each other is 25 to 400 nm.

5 . A method of manufacturing an aluminum member, comprising:
preparing a base material made of aluminum or an aluminum alloy; and performing anodization on the base material in an electrolytic solution under conditions where a current density is 5 to 30 mA·cm − and a temperature of the electrolytic solution is 0 to 80° C., the electrolytic solution comprising: a first acid or a salt of the first acid at a concentration of 0.01 to 2.0 mol·dm −3 , the first acid being selected from the group consisting of an inorganic acid and an organic carboxylic acid; and a second acid at a concentration of 0.01 to 5.0 mol·dm −3 , the second acid being an acid anhydride.

6 . The method of manufacturing an aluminum member according to claim 5 , wherein the second acid is at least one acid anhydride selected from the group consisting of diphosphoric acid, triphosphoric acid, and polyphosphoric acid.

Assignees

• Uacj Corp

Inventors

• NUNOMURA Junji

Classifications

• C25D11/08 Primary

  containing inorganic acids · CPC title

• C25D11/10

  containing organic acids · CPC title

• C25D11/06 Primary

  characterised by the electrolytes used · CPC title