Method of manufacturing a brazing sheet

Patent metadata

Field	Value
Publication number	US-2025083205-A1
Application number	US-202118024987-A
Country	US
Kind code	A1
Filing date	Sep 22, 2021
Priority date	Sep 25, 2020
Publication date	Mar 13, 2025
Grant date	—

Abstract

A method of manufacturing a brazing sheet includes layering at least a core-material slab composed of an aluminum material and a filler-material slab composed of an Al—Si series alloy to prepare a clad slab. At least one aluminum slab in the clad slab, which is disposed in a range from the core-material slab to the filler-material slab inclusive, contains a metal element that oxidizes more readily than Al. The clad slab is hot rolled to prepare a clad sheet that includes a core material composed of the core-material slab and a filler material composed of the filler-material slab. Then, one or more passes of cold rolling is performed on the clad sheet. Between passes of cold rolling or after completion of the cold rolling, at least one surface of the clad sheet is etched using an alkaline etching solution having a sodium hydroxide concentration of 0.05-1.0 mass %.

First claim

1 . A method of manufacturing a brazing sheet for performing brazing of an aluminum material in an inert-gas atmosphere without using flux, comprising:
a layering process wherein a plurality of aluminum slabs are layered, the aluminum slabs including a core-material slab composed of an aluminum material and a filler-material slab composed of an Al—Si series alloy and disposed on at least one surface of the core-material slab, and wherein a clad slab is prepared in which at least one aluminum slab, from among the plurality of the aluminum slabs, disposed in the span from the core-material slab to the filler-material slab inclusive contains a metal element that oxidizes more readily than Al; a hot-rolling process wherein hot rolling is performed on the clad slab and a clad sheet is prepared that comprises a core material, which is composed of the core-material slab, and a filler material, which is composed of the filler-material slab and disposed on at least one surface of the core material; a cold-rolling process wherein one or more passes of cold rolling is performed on the clad sheet; and an etching process wherein, between passes of cold rolling in the cold-rolling process or after completion of the cold-rolling process, a surface of the clad sheet is etched using an alkaline etching solution in which the NaOH concentration is 0.05 mass % or more and 1.0 mass % or less.

2 . The method of manufacturing a brazing sheet according to claim 1 , wherein KOH is additionally dissolved in the alkaline etching solution, and the KOH concentration in the alkaline etching solution is 0.10 mass % or more and 1.0 mass % or less.

3 . The method of manufacturing a brazing sheet according to claim 1 , further comprising a smut-removal process wherein, after the etching process, smut that has formed on the surface of the clad sheet in the etching process is removed using a desmutting solution that contains at least one from among sulfuric acid and nitric acid.

4 . The method of manufacturing a brazing sheet according to claim 1 , wherein the Al—Si series alloy that constitutes the filler-material slab has a chemical composition that contains Si: 4.0 mass % or more and 13.0 mass % or less, Mg: 0 mass % or more and 3.0 mass % or less, Li: 0 mass % or more and 0.30 mass % or less, Ca: 0 mass % or more and 0.30 mass % or less, Bi: 0 mass % or more and 1.0 mass % or less, Na: 0 mass % or more and 0.050 mass % or less, Sr: 0 mass % or more and 0.050 mass % or less, Sb: 0 mass % or more and 0.050 mass % or less, Zn: 0 mass % or more and 8.0 mass % or less, Cu: 0 mass % or more and 4.0 mass % or less, Fe: 0 mass % or more and 1.0 mass % or less, Mn: 0 mass % or more and 1.0 mass % or less, Cr: 0 mass % or more and 0.30 mass % or less, Ti: 0 mass % or more and 0.30 mass % or less, Zr: 0 mass % or more and 0.30 mass % or less, Sn: 0 mass % or more and 0.10 mass % or less, and In: 0 mass % or more and 0.10 mass % or less, the remainder being Al and unavoidable impurities.

5 . The method of manufacturing a brazing sheet according to claim 1 , wherein the aluminum material that constitutes the core-material slab has a chemical composition that contains Fe: 0 mass % or more and 1.5 mass % or less, Si: 0 mass % or more and 1.5 mass % or less, Mg: 0 mass % or more and 3.0 mass % or less, Cu: 0 mass % or more and 2.0 mass % or less, Mn: 0 mass % or more and 2.0 mass % or less, Zn: 0 mass % or more and 6.5 mass % or less, Cr: 0 mass % or more and 0.30 mass % or less, Ti: 0 mass % or more and 0.30 mass % or less, Zr: 0 mass % or more and 0.30 mass % or less, Sn: 0 mass % or more and 0.10 mass % or less, and In: 0 mass % or more and 0.10 mass % or less, the remainder being Al and unavoidable impurities.

6 . The method of manufacturing a brazing sheet according to claim 1 , wherein the clad slab comprises the core-material slab, the filler-material slab, which is disposed on one surface of the core-material slab, and a skin-material slab, which is composed of an aluminum material and is disposed on the other surface of the core-material slab, and the aluminum material that constitutes the skin-material slab has a chemical composition that contains Fe: 0 mass % or more and 1.5 mass % or less, Si: 0 mass % or more and 5.0 mass % or less, Mg: 0 mass % or more and 3.0 mass % or less, Cu: 0 mass % or more and 1.0 mass % or less, Mn: 0 mass % or more and 2.0 mass % or less, Zn: 0 mass % or more and 6.5 mass % or less, Cr: 0 mass % or more and 0.30 mass % or less, Ti: 0 mass % or more and 0.30 mass % or less, Zr: 0 mass % or more and 0.30 mass % or less, Sn: 0 mass % or more and 0.10 mass % or less, and In: 0 mass % or more and 0.10 mass % or less, the remainder being Al and unavoidable impurities.

7 . The method of manufacturing a brazing sheet according to claim 2 , further comprising, after the etching process, removing smut that has formed on the surface of the clad sheet in the etching process using a desmutting solution that contains at least one acid selected from the group consisting of sulfuric acid and nitric acid.

8 . The method of manufacturing a brazing sheet according to claim 7 , wherein the Al—Si series alloy that constitutes the filler-material slab has a chemical composition that contains Si: 4.0 mass % or more and 13.0 mass % or less, Mg: 0 mass % or more and 3.0 mass % or less, Li: 0 mass % or more and 0.30 mass % or less, Ca: 0 mass % or more and 0.30 mass % or less, Bi: 0 mass % or more and 1.0 mass % or less, Na: 0 mass % or more and 0.050 mass % or less, Sr: 0 mass % or more and 0.050 mass % or less, Sb: 0 mass % or more and 0.050 mass % or less, Zn: 0 mass % or more and 8.0 mass % or less, Cu: 0 mass % or more and 4.0 mass % or less, Fe: 0 mass % or more and 1.0 mass % or less, Mn: 0 mass % or more and 1.0 mass % or less, Cr: 0 mass % or more and 0.30 mass % or less, Ti: 0 mass % or more and 0.30 mass % or less, Zr: 0 mass % or more and 0.30 mass % or less, Sn: 0 mass % or more and 0.10 mass % or less, and In: 0 mass % or more and 0.10 mass % or less, the remainder being Al and unavoidable impurities.

9 . The method of manufacturing a brazing sheet according to claim 8 , wherein the aluminum material that constitutes the core-material slab has a chemical composition that contains Fe: 0 mass % or more and 1.5 mass % or less, Si: 0 mass % or more and 1.5 mass % or less, Mg: 0 mass % or more and 3.0 mass % or less, Cu: 0 mass % or more and 2.0 mass % or less, Mn: 0 mass % or more and 2.0 mass % or less, Zn: 0 mass % or more and 6.5 mass % or less, Cr: 0 mass % or more and 0.30 mass % or less, Ti: 0 mass % or more and 0.30 mass % or less, Zr: 0 mass % or more and 0.30 mass % or less, Sn: 0 mass % or more and 0.10 mass % or less, and In: 0 mass % or more and 0.10 mass % or less, the remainder being Al and unavoidable impurities.

10 . The method of manufacturing a brazing sheet according to claim 9 , wherein the clad slab comprises the core-material slab, the filler-material slab, which is disposed on one surface of the core-material slab, and a skin-material slab, which is composed of an aluminum material and is disposed on the other surface of the core-material slab, and the aluminum material that constitutes the skin-material slab has a chemical composition that contains Fe: 0 mass % or more and 1.5 mass % or less, Si: 0 mass % or more and 5.0 mass % or less, Mg: 0 mass % or more and 3.0 mass % or less, Cu: 0 mass % or more and 1.0 mass % or less, Mn: 0 mass % or more and 2.0 mass % or less, Zn: 0 mass % or more and 6.5 mass % or less, Cr: 0 mass % or more and 0.30 mass % or less, Ti: 0 mass % or more and 0.30 mass % or less, Zr: 0 mass % or more and 0.30 mass % or less, Sn: 0 mass % or more and 0.10 mass % or less, and In: 0 mass % or more and 0.10 mass % or

Assignees

• Uacj Corp

Inventors

• Yanagawa Yutaka
• Suzuki Taichi
• YAMAYOSHI Tomoki
• Ide Tatsuya

Classifications

• B23K35/286

  Al as the principal constituent · CPC title

• B23K35/0238

  layered · CPC title

• B21B2001/225

  by hot-rolling · CPC title

• B21B2001/221

  by cold-rolling · CPC title

• B23K35/383

  mainly containing noble gases or nitrogen · CPC title