Aluminum member and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11932956-B2
Application number	US-202017024613-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Mar 28, 2018
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

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,
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 in the region of the anodized coating located at the depth of 500 nm or more from the surface of the anodized coating)>(the maximum content of P in the region situated at a depth of 0 nm or more from the surface of the anodized coating) holds,
when amounts of S anal 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 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, wherein each of T S , M S , T P and M P is expressed as an integrated value of the amount S or P, respectively, in the depth direction.

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

3. 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 by using an electrolytic solution, the electrolytic solution comprising:
(a) a first acid being an inorganic acid or a salt of the first acid, wherein the first acid contains S; 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.

4. The method of manufacturing an aluminum member according to claim 3 , 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 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 .

5. The method of manufacturing an aluminum member according to claim 3 , 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

• C25D11/08 Primary

  containing inorganic acids · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• B32B15/20

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

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• C23C30/005

  on hard metal substrates · CPC title