Aluminum member and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2021002783-A1
Application number	US-202017024613-A
Country	US
Kind code	A1
Filing date	Sep 17, 2020
Priority date	Mar 28, 2018
Publication date	Jan 7, 2021
Grant date	—

Abstract

An aluminum member includes: a base material made of aluminum or an aluminum alloy; and an anodized coating including a barrier layer on a surface of the base material and a porous layer on the barrier layer, wherein the anodized coating contains phosphorus (P) and sulfur (S), and has a thickness of 100 μm or less, and, in a depth direction heading from a surface of the anodized coating toward the base material, a depth providing a maximum content of S in a region situated at a depth of 500 nm or more from the surface of the anodized coating is larger than a depth providing a maximum content of P, and an inequality (the maximum content of S)>(the maximum content of P) holds.

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 comprising a barrier layer on a surface of the base material and a porous layer on the barrier layer, wherein the anodized coating contains phosphorous (P) and sulfur (S), and has a thickness of 100 μm or less, and, in a depth direction heading from a surface of the anodized coating toward the base material, a depth providing a maximum content of S in a region situated at a depth of 500 nm or more from the surface of the anodized coating is larger than a depth providing a maximum content of P in a region situated at a depth of 0 nm or more from the surface of the anodized coating, and an inequality (the maximum content of S)>(the maximum content of P) holds.

2 . The aluminum member according to claim 1 , wherein, when amounts of S and P existing over the depth direction of the anodized coating are defined as T S and T P , respectively, and amounts of S and P existing in the base material at the depth exceeding 100 μm and not more than 200 μm from the surface of the anodized coating are defined as M S and M P , respectively, equalities hold as follows:
T S /M S =1.5 to 1500; and
T P /M P =10 to 9000.

3 . The aluminum member according to claim 2 , wherein P in an amount of 0.9×T P exists in a region to a depth of 1 μm from the surface of the anodized coating.

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

5 . The method of manufacturing an aluminum member according to claim 4 , wherein, in performing anodization,
a concentration of the first acid or the salt of the first acid in the electrolytic solution is 0.01 to 10 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 .

6 . The method of manufacturing an aluminum member according to claim 4 , wherein, in performing anodization, the anodization 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

Inventors

• Kikuchi Mihoko
• NUNOMURA Junji

Classifications

• C25D11/16

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

• C25D11/04

  of aluminium or alloys based thereon · CPC title

• C25D11/10 Primary

  containing organic acids · CPC title

• C25D11/08 Primary

  containing inorganic acids · CPC title

• Y10T428/12618

  Plural oxides · CPC title