Method for producing electrolytic aluminum foil

Patent metadata

Field	Value
Publication number	US-2018080134-A1
Application number	US-201715825794-A
Country	US
Kind code	A1
Filing date	Nov 29, 2017
Priority date	Sep 5, 2015
Publication date	Mar 22, 2018
Grant date	—

Abstract

A method for producing high quality electrolytic aluminum foil excellent in peelability from a cathode surface is provided. A method for producing electrolytic aluminum foil according to the present disclosure is a method for producing electrolytic aluminum foil, comprising steps of depositing an aluminum film on a surface of a cathode in an electrolytic cell supplied with an electrolytic solution and comprising the cathode; and peeling the deposited aluminum film from the surface of the cathode to provide aluminum foil, wherein the cathode has surface roughness of an arithmetic average roughness (Ra) of 0.10 to 0.40 μm and a ten-point average roughness (Rz) of 0.20 to 0.70 μm.

First claim

What is claimed is:

1 . A method for producing electrolytic aluminum foil, comprising:
depositing an aluminum film on a surface of a cathode in an electrolytic cell supplied with an electrolytic solution and comprising the cathode; and peeling the deposited aluminum film from the surface of the cathode to provide aluminum foil, wherein the cathode has surface roughness of an arithmetic average roughness (Ra) of 0.10 to 0.40 μm and a ten-point average roughness (Rz) of 0.20 to 0.70 μm.

2 . The method for producing electrolytic aluminum foil according to claim 1 , wherein the cathode is a drum made of titanium.

3 . The method for producing electrolytic aluminum foil according to claim 1 , wherein the electrolytic solution is a molten salt containing 0.01 to 0.5 g/L of 1-10 phenanthroline monohydrate,
current density is 10 to 100 mA/cm 2 , and in the aluminum foil, an arithmetic average roughness Ra of a foil surface is in a range of 0.10 μm or more and 2.50 μm or less at any site, and an average grain diameter is in a range of 1.00 μm or more and 5.00 μm or less at any site.

4 . The method for producing electrolytic aluminum foil according to claim 3 , wherein a difference in the arithmetic average roughness Ra of the foil surface when the arithmetic average roughness Ra is measured in a central portion in a width direction and in an end portion in the width direction on the foil surface is 2.00 μm or less.

5 . The method for producing electrolytic aluminum foil according to claim 1 , wherein the electrolytic solution is a molten salt containing an alkylimidazolium halide and an aluminum halide, or a molten salt containing an alkylpyridinium halide and an aluminum halide.

6 . The method for producing electrolytic aluminum foil according to claim 1 , wherein the surface roughness of the cathode is adjusted by electropolishing.

Assignees

• Uacj Corp

Inventors

• Honkawa Yukio
• NUNOMURA Junji
• Kojima Yoichi

Classifications

• C25D1/04 Primary

  Wires; Strips; Foils · CPC title

• C25D1/20

  Separation of the formed objects from the electrodes {with no destruction of said electrodes} · CPC title

• C25D3/665

  from ionic liquids · CPC title

• C25D3/44

  Aluminium · CPC title