Clad aluminum alloy material with excellent corrosion resistance and brazeability and method for producing the same

Patent metadata

Field	Value
Publication number	US-10183362-B2
Application number	US-201515125968-A
Country	US
Kind code	B2
Filing date	Mar 11, 2015
Priority date	Mar 19, 2014
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A clad aluminum alloy material exhibiting favorable corrosion resistance and brazeability in an alkaline environment is shown by a clad aluminum alloy material with excellent brazeability and corrosion resistance in which one surface of an aluminum alloy core material is clad with a sacrificial anode material and the other surface is clad with brazing filler material. The core material includes an aluminum alloy of Si: 0.3-1.5%, Fe: 0.1-1.5%, Cu: 0.2-1.0%, Mn: 1.0-2.0%, and Si content+Fe content ≥0.8%, wherein the 1-20 μm equivalent circle diameter Al—Mn—Si—Fe-based intermetallic compound density is 3.0×10 5 to 1.0×10 6 pieces/cm 2 , and the 0.1 μm to less than 1 μm equivalent circle diameter Al—Mn—Si—Fe-based intermetallic compound density is at least 1.0×10 7 pieces/cm 2 . The sacrificial anode material includes an aluminum alloy containing Si: 0.1-0.6%, Zn: 1.0-5.0%, and Ni: 0.1-2.0%.

First claim

The invention claimed is:

1. A clad aluminum alloy material with excellent brazeability and corrosion resistance, comprising:
an aluminum alloy core material,
a sacrificial anode material clad on one surface of the core material and
an Al—Si-based brazing filler metal clad on the other surface of the core material,
wherein the core material comprises an aluminum alloy comprising Si: 0.3 to 1.5 mass %, Fe: 0.1 to 1.5 mass %, Cu: 0.2 to 1.0 mass %, Mn: 1.0 to 2.0 mass % and a balance of Al and unavoidable impurities, the aluminum alloy satisfies the relation that Si content+Fe content ≥0.8 mass %, the 1-20 μm equivalent circle diameter Al—Mn—Si—Fe-based intermetallic compound density is 3.0×10 5 to 1.0×10 6 pieces/cm 2 , and the 0.1 μm to less than 1 μm equivalent circle diameter Al—Mn—Si—Fe-based intermetallic compound density is at least 1.0×10 7 pieces/cm 2 , and
the sacrificial anode material comprises an aluminum alloy comprising Si: 0.1 to 0.6 mass %, Zn: 1.0 to 5.0 mass %, Ni: 0.1 to 2.0 mass % and a balance of Al and unavoidable impurities.

2. The clad aluminum alloy material with excellent brazeability and corrosion resistance according to claim 1 , wherein the core material further comprises one or, two or more selected from Ti: 0.05 to 0.20 mass %, Zr: 0.05 to 0.20 mass %, V: 0.05 to 0.20 mass % and Cr: 0.05 to 0.20 mass %.

3. The clad aluminum alloy material according to claim 1 , wherein the crystal grain size of the core material is capable of achieving at least 150 μm after brazing correspondent heating at 600° C. for three minutes.

4. The clad aluminum alloy material according to claim 1 , which is capable of having a tensile strength of at least 140 MPa after brazing correspondent heating at 600° C. for three minutes.

5. The clad aluminum alloy material according to claim 1 having an elongation of at least 5% along the rolling direction.

6. A method for producing the clad aluminum alloy material according to claim 1 , comprising:
a step of casting the aluminum alloys for the core material, the sacrificial anode material and the brazing filler metal, respectively,
a post-casting heat treatment step of soaking the core material slab at a high temperature,
a cladding step of cladding the sacrificial anode material slab rolled to a predetermined thickness on one surface of the core material slab and cladding the brazing filler metal slab rolled to a predetermined thickness on the other surface,
a hot clad rolling step of hot rolling the clad material,
a cold rolling step of cold rolling the hot-clad-rolled clad material and
an annealing step of annealing the clad material at least during the cold rolling step or after the cold rolling step,
wherein the step of casting the core material slab has a casting cooling stage of cooling the slab at a rate of at least 5° C./second,
the post-casting heat treatment step has a soaking stage of soaking the cooled slab at 550 to 620° C. for at least 5 hours and a cooling stage of cooling the soaked slab at a rate of at least 50° C./hour,
the hot clad rolling step has a pre-rolling heating stage at 400 to 480° C. for at least 5 hours, and
an annealing temperature in the annealing step is 400° C. or lower.

7. The method for producing the clad aluminum alloy material according to claim 6 , wherein the rolling start temperature of the hot clad rolling is 480 to 350° C., and the rolling finish temperature is 350 to 250° C.

8. The method for producing the clad aluminum alloy material according to claim 6 , wherein in the cooling stage of the post-casting heat treatment step, the soaked slab is cooled at a rate of 50° C./hour to 70° C./hour.

Assignees

• Uacj Corp

Inventors

• Narita Wataru

Classifications

• B23K35/28

  with the principal constituent melting at less than 950°C · CPC title

• B23K2101/14

  Heat exchangers · CPC title

• C22C23/02

  with aluminium as the next major constituent · CPC title

• B23K35/0238 Primary

  layered · CPC title

• F28F21/089

  Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence) · CPC title