Aluminum alloy clad material

Patent metadata

Field	Value
Publication number	US-11045911-B2
Application number	US-202016918096-A
Country	US
Kind code	B2
Filing date	Jul 1, 2020
Priority date	Jul 3, 2019
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A sacrificial material on one surface of a core material, a Al brazing material containing Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and Al balance and satisfying (Bi+Mg)×Sr≤0.1 is disposed on the other surface, Mg—Bi-based compounds of the brazing material with a diameter of 0.1-5.0 μm are more than 20 per 10,000-μm2 and the Mg—Bi-based compounds with a diameter of 5.0 μm or more are less than 2 before brazing, the core material contains Mn: 1.0% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, Mg: 0.1% to 0.7%, and Al balance, the sacrificial material contains Zn: 0.5% to 6.0% and Mg of which a content is limited to 0.1% or less, and a Mg concentration on a surface of the sacrificial material after brazing is 0.15% or less.

First claim

What is claimed is:

1. An aluminum alloy clad material comprising:
a sacrificial material disposed on one surface of a core material; and
an Al—Si—Mg—Bi brazing material which is disposed on the other surface of the core material, wherein the Al—Si—Mg—Bi brazing material comprises, by mass %, from 6.0% to 14.0% of Si, from 0.05% to 1.5% of Mg, from 0.05% to 0.25% of Bi, from 0.0001% to 0.1% of Sr, and a balance consisting of Al and inevitable impurities, and satisfies a relationship of (Bi+Mg)×Sr≤0.1 in amounts of elements by mass %,
wherein the Al—Si—Mg—Bi brazing material comprises more than 20 in number per 10,000-μm 2 visual field of Mg—Bi compounds having a diameter of from 0.1 μm to less than 5.0 μm in terms of equivalent circle diameter and less than 2 in number per 10,000-μm 2 visual field of the Mg—Bi compounds having a diameter of 5.0 μm or more, when observed in a surface layer plane direction before brazing,
the core material comprises, by mass %, from 1.0% to 1.7% of Mn, from 0.2% to 1.0% of Si, from 0.1% to 0.5% of Fe, from 0.08% to 1.0% of Cu, and a balance consisting of Al and inevitable impurities, and
the sacrificial material comprises, by mass %, from 0.5% to 6.0% of Zn and 0.1% or less of Mg, wherein a Mg concentration on a surface of the sacrificial material after brazing is 0.15% or less.

2. The aluminum alloy clad material according to claim 1 , wherein the core material further comprises, by mass %, from 0.1% to 0.7% of Mg.

3. The aluminum alloy clad material according to claim 1 , wherein the core material further comprises, by mass %, from 0.05% to 0.3% of Ti.

4. The aluminum alloy clad material according to claim 2 , wherein the core material further comprises, by mass %, from 0.05% to 0.3% of Ti.

5. The aluminum alloy clad material according to claim 1 , wherein, of natural potentials of a lowest portion of the sacrificial material and a central portion of the core material after brazing, the natural potential of the lowest portion of the sacrificial material is lower, a difference between the natural potentials is from 70 to 280 mV, and a potential difference between an outermost surface and the lowest portion of the sacrificial material is 50 mV or less.

6. The aluminum alloy clad material according to claim 2 , wherein, of natural potentials of a lowest portion of the sacrificial material and a central portion of the core material after brazing, the natural potential of the lowest portion of the sacrificial material is lower, a difference between the natural potentials is from 70 to 280 mV, and a potential difference between an outermost surface and the lowest portion of the sacrificial material is 50 mV or less.

7. The aluminum alloy clad material according to claim 3 , wherein, of natural potentials of a lowest portion of the sacrificial material and a central portion of the core material after brazing, the natural potential of the lowest portion of the sacrificial material is lower, a difference between the natural potentials is from 70 to 280 mV, and a potential difference between an outermost surface and the lowest portion of the sacrificial material is 50 mV or less.

8. The aluminum alloy clad material according to claim 4 , wherein, of natural potentials of a lowest portion of the sacrificial material and a central portion of the core material after brazing, the natural potential of the lowest portion of the sacrificial material is lower, a difference between the natural potentials is from 70 to 280 mV, and a potential difference between an outermost surface and the lowest portion of the sacrificial material is 50 mV or less.

9. The aluminum alloy clad material according to claim 1 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

10. The aluminum alloy clad material according to claim 2 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

11. The aluminum alloy clad material according to claim 3 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

12. The aluminum alloy clad material according to claim 4 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

13. The aluminum alloy clad material according to claim 5 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

14. The aluminum alloy clad material according to claim 6 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

15. The aluminum alloy clad material according to claim 7 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

16. The aluminum alloy clad material according to claim 8 , wherein the sacrificial material further comprises, by mass %, at least one of from 0.2% to 0.8% of Si, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti.

17. The aluminum alloy clad material according to claim 1 , wherein the Al—Si—Mg—Bi brazing material comprises, by mass %, from 0.1% to 1.5% of Mg.

18. The aluminum alloy clad material according to claim 1 , wherein the Al—Si—Mg—Bi brazing material comprises, by mass %, from 0.2% to 1.5% of Mg.

Assignees

• Mitsubishi Aluminium
• Denso Corp

Inventors

• Mori Yoshiki
• Miyake Hideyuki
• Yoshino Michihide
• Iwao Shohei
• Edo Masakazu
• Sugimoto Naoki
• Honma Nobuhiro
• Yamada Shogo
• Teramoto Hayaki
• Toyama Taketoshi

Classifications

• B23K35/286 Primary

  Al as the principal constituent · CPC title

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title

• B23K2101/14

  Heat exchangers · CPC title

• B32B15/016

  all layers being formed of aluminium or aluminium alloys · CPC title

• B23K35/0238 Primary

  layered · CPC title