Aluminum member and method for producing same

Patent metadata

Field	Value
Publication number	US-11248281-B2
Application number	US-201816642145-A
Country	US
Kind code	B2
Filing date	Aug 2, 2018
Priority date	Aug 29, 2017
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

An aluminum member includes: a substrate formed of aluminum or an aluminum alloy that contains 0 to 10% by mass of magnesium, 0.1% by mass or less of iron, and 0.1% by mass or less of silicon and a balance of which is aluminum and unavoidable impurities; and an anodic oxide coating formed on a surface of the substrate. A surface of the substrate on the anodic oxide coating side has an arithmetical mean height Sa of 0.1 to 0.5 μm, a maximum height Sz of 0.2 to 5 μm, and an mean width of roughness profile elements Rsm of 0.5 to 10 μm, where the arithmetical mean height Sa, the maximum height Sz, and the mean width of roughness profile elements Rsm are measured after the anodic oxide coating is removed.

First claim

The invention claimed is:

1. A method of producing an aluminum member comprising a substrate and an anodic oxide coating comprising
making particles having an average particle diameter of 20 μm or less hit against a surface of the substrate by dry blasting;
etching the substrate against which the particles have hit, using at least one of an acidic solution and an alkaline solution; and
forming the anodic oxide coating by anodizing an etched surface of the substrate,
wherein the substrate is formed of aluminum or an aluminum alloy that contains 0 to 10% by mass of magnesium, 0.1% by mass or less of iron, and 0.1% by mass or less of silicon and a balance of which is aluminum and unavoidable impurities,
wherein the anodic oxide coating is formed on the surface of the substrate, and
wherein the surface of the substrate on the anodic oxide coating side has an arithmetical mean height Sa of 0.1 to 0.5 μm, a maximum height Sz of 0.2 to 5 μm, and an mean width of roughness profile elements Rsm of 0.5 to 10 μm, where the arithmetical mean height Sa, the maximum height Sz, and the mean width of roughness profile elements Rsm are measured in a case where the anodic oxide coating is removed.

2. The method of producing the aluminum member according to claim 1 , wherein
the substrate consists of 0 to 10% by mass of magnesium, 0.1% by mass or less of iron, and 0.1% by mass or less of silicon and the balance of which is aluminum and 0.5% by mass or less of unavoidable impurities,
and a content of each element contained as the unavoidable impurities is 0.05% by mass or less.

3. The method of producing the aluminum member according to claim 1 , wherein
the substrate consists of 0 to 10% by mass of magnesium, 0.1% by mass or less of iron, and 0.1% by mass or less of silicon and the balance of which is aluminum and 0.15% by mass or less of unavoidable impurities,
and a content of each element contained as the unavoidable impurities is 0.05% by mass or less.

4. The method of producing the aluminum member according to claim 1 , wherein the anodic oxide coating is formed by using at least one aqueous solution selected from the group consisting of sulfuric acid, phosphoric acid, and oxalic acid.

5. The method of producing the aluminum member according to claim 1 , wherein a time of the etching is 5 to 90 seconds.

6. The method of producing the aluminum member according to claim 1 , wherein
the aluminum member has an L* value of 85 to 100, an a* value of −1 to +1, and a b* value of −1.5 to +1.5, where the L* value, the a* value, and the b* value are values in a L*a*b* color system measured from the anodic oxide coating side.

7. The method of producing the aluminum member according to claim 1 , wherein
a surface of the anodic oxide coating has an arithmetical mean height Sa of 0 to 0.45 μm, and the L* value is 85.5 to 100.

8. The method of producing the aluminum member according to claim 1 , further comprising
polishing a surface of the anodic oxide coating by at least one of blast polishing and buff polishing.

Assignees

• Nippon Light Metal Co

Inventors

• Seki Yusuke
• Taguchi Yoshihiro

Classifications

• C25D11/10

  containing organic acids · CPC title

• C25D11/16

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

• C25D11/08

  containing inorganic acids · CPC title

• C25D11/04

  of aluminium or alloys based thereon · CPC title

• C22C21/08 Primary

  with silicon · CPC title