Corrosion resistant aluminum electrode alloy

Patent metadata

Field	Value
Publication number	US-2020332395-A1
Application number	US-202016923886-A
Country	US
Kind code	A1
Filing date	Jul 8, 2020
Priority date	Jan 31, 2018
Publication date	Oct 22, 2020
Grant date	—

Abstract

New aluminum alloy compositions are provided. The new aluminum alloy compositions may include, for instance, from 20 to 600 ppm Fe and from 10 to 800 ppm Mn. A ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy may be from 0.25:1 to 7:1. The new aluminum alloys may be useful, for instance, as an electrode alloy product.

First claim

What is claimed is:

1 . An aluminum alloy comprising:
a) 20-600 ppm Fe; b) 10-800 ppm Mn; and c) at least 0.005 vol. % of Fe—Mn-bearing intermetallic particles, wherein:
(i) a ratio of Fe (ppm)-to-Mn (ppm) in the aluminum composition alloy is from 0.25:1 to 7:1.

2 . The aluminum alloy of claim 1 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy is at least 0.5.

3 . The aluminum alloy of claim 3 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy is at least 0.9.

4 . The aluminum alloys of claim 1 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy is not greater than 5.0.

5 . The aluminum alloy of claim 5 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy is not greater than 3.0.

6 . The aluminum alloy of claim 6 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy is not greater than 1.5.

7 . The aluminum alloy of claim 1 comprising not greater than 0.04 vol. % of the Fe—Mn-bearing intermetallic particles.

8 . The aluminum alloy of claim 1 , wherein the aluminum alloy composition comprises one of (a) 20-500 ppm Zn, (b) 20-500 ppm Ga, or (c) 20-500 ppm Zn and 20-500 ppm Ga.

9 . A method comprising:
a) forming an aluminum alloy melt, wherein the forming comprises:
(i) using 20-600 ppm Fe in the melt; and
(ii) using 10-800 ppm Mn in the melt, wherein:
(A) a ratio of Fe (ppm)-to-Mn (ppm) in the melt is from 0.25:1 to 7:1; and

b) depositing the melt to form an aluminum electrode alloy product, wherein the depositing comprises:
(i) casting the melt into the aluminum electrode alloy product; and
(ii) producing at least 0.005 vol. % of Fe—Mn-bearing intermetallic particles,
wherein the aluminum electrode alloy product includes the at least 0.005 vol. % of the Fe—Mn-bearing intermetallic particles.

10 . The method of claim 9 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the melt is at least 0.9.

11 . The method of claim 10 , wherein the ratio of Fe (ppm)-to-Mn (ppm) in the melt is not greater than 1.5.

12 . The method of claim 11 , wherein the aluminum electrode alloy product includes not greater than 0.04 vol. % of the Fe—Mn-bearing intermetallic particles.

13 . A 5xxx aluminum alloy comprising:
a) 0.2-5.0 wt. % Mg; b) 20-600 ppm Fe; and c) 10-800 ppm Mn, wherein a ratio of Fe (ppm)-to-Mn (ppm) in the aluminum composition alloy is from 0.25:1 to 7:1.

14 . The 5xxx aluminum alloy composition of claim 13 , wherein the aluminum alloy composition includes:
70-110 ppm Fe; 30-50 ppm Mn;
wherein a ratio of Fe (ppm)-to-Mn (ppm) in the aluminum alloy composition is from 1.4:1 to 3.6:1;
90-110 ppm Zn; and 90-110 ppm Ga.

15 . The 5xxx aluminum alloy of claim 14 , wherein the 5xxx aluminum alloy comprises from 0.005 to 0.04 vol. % of Fe—Mn-bearing intermetallic particles.

Assignees

• Arconic Tech Llc

Inventors

• Weiland Hasso
• Ralph Elizabeth L

Classifications

• C25B11/061

  Metal or alloy · CPC title

• C25B11/063

  Valve metal, e.g. titanium · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/463

  Aluminium based · CPC title

• C22C21/06 Primary

  with magnesium as the next major constituent · CPC title