Corrosion-resistant brazing sheet package
View Patent ↗This application discloses a corrosion-resistant brazing sheet package for use in manufacturing tubing. The brazing sheet package includes a core layer of aluminum-containing alloy comprising from 0.1 wt % to 0.2 wt % of titanium. The core layer has a first side and a second side. The first side of the core layer is adjacent to a first cladding layer to form a first interface. The second side of the core layer is adjacent to a second cladding layer to form a second interface. The first cladding layer and the second cladding layer each include from 2.5 wt % to 4.0 wt % of zinc.
1. A multi-layer metal sheet, comprising:
a core layer of aluminum-containing alloy comprising up to 0.25 wt. % of Si, up to 0.25 wt. % of Fe, from 0.5 to 0.6 wt. % of Cu, from 1.4 to 1.6 wt. % of Mn, from 0.06 to 0.14 wt. % of Mg, up to 0.05 wt. % of Cr, up to 0.04 wt. % of Zn, from 0.1 to 0.2 wt. % of Ti, up to 0.05 wt. % of Sr, up to 0.15 wt. % impurities, and the balance aluminum, wherein the core layer has a first side and a second side;
a first cladding layer on the first side of the core layer, wherein the first cladding layer comprises from 2.5 wt % to 4.0 wt % of zinc and from 6 wt. % to 13 wt. % of Si; and
a second cladding layer on the second side of the core laver, wherein the second cladding layer comprises from 2.5 wt % to 4.0 wt % of zinc and from 6 wt. % to 13 wt. % of Si.
2. The multi-layer metal sheet of claim 1 , wherein the first cladding layer and the second cladding layer comprise the same or different alloys.
3. The multi-layer metal sheet of claim 1 ,
wherein the first side of the core layer is adjacent to the first cladding layer to form a first interface and the second side of the core layer is adjacent to a second cladding layer to form a second interface.
4. The multi-layer metal sheet of claim 1 , wherein the first cladding layer and the second cladding layer are made of an alloy comprising from 6 to 13 wt. % of Si, up to 0.4 wt. % of Fe, up to 0.1 wt. % of Cu, up to 0.1 wt. % of Mn, up to 0.15 wt. % of Mg, up to 0.05 wt. % of Cr, from 2.5 to 4.0 wt. % of Zn, up to 0.05 wt. % of Ti, up to 0.02 wt. % of Sr, up to 0.15 wt. % impurities, and the balance aluminum.
5. The multi-layer metal sheet of claim 1 , further comprising a fin.
6. The multi-layer metal sheet of claim 5 , wherein the fin is a zinc-containing fin.
7. The multi-layer metal sheet of claim 6 , wherein the fin contains zinc in an amount of 1.5 wt. % or more.
8. The multi-layer metal sheet of claim 5 , wherein the fin is an aluminum-containing fin.
9. A tube made of the multi-layer metal sheet of claim 1 .
10. The multi-layer metal sheet of claim 1 , wherein the alloy of the core layer is produced by direct chill casting, followed by hot and cold rolling.
11. A heat exchanger comprising the multi-layer metal sheet of claim 1 .
12. A multi-layer metal sheet, comprising:
a core layer of aluminum-containing alloy comprising up to 0.25 wt. % of Si, up to 0.25 wt. % of Fe, from 0.5 to 0.6 wt. % of Cu, from 1.4 to 1.6 wt. % of Mn, from 0.06 to 0.14 wt. % of Mg, up to 0.05 wt. % of Cr, up to 0.04 wt. % of Zn, from 0.1 to 0.2 wt. % of Ti, up to 0.05 wt. % of Sr, up to 0.15 wt. % impurities, and the balance aluminum, wherein the core layer has a first side and a second side;
a first cladding layer comprising from 6 to 13 wt. % of Si, up to 0.4 wt. % of Fe, up to 0.1 wt. % of Cu, up to 0.1 wt. % of Mn, up to 0.15 wt. % of Mg, up to 0.05 wt. % of Cr, from 2.5 to 4.0 wt. % of Zn, up to 0.05 wt. % of Ti, up to 0.02 wt. % of Sr, up to 0.15 wt. % impurities, and the balance aluminum; and
a second cladding layer comprising from 6 to 13 wt. % of Si, up to 0.4 wt. % of Fe, up to 0.1 wt. % of Cu, up to 0.1 wt. % of Mn, up to 0.15 wt. % of Mg, up to 0.05 wt. % of Cr, from 2.5 to 4.0 wt. % of Zn, up to 0.05 wt. % of Ti, up to 0.02 wt. % of Sr, up to 0.15 wt. % impurities, and the balance aluminum,
wherein the first side of the core layer is adjacent to the first cladding layer to form a first interface and the second side of the core layer is adjacent to a second cladding layer to form a second interface.
13. A tube made of the multi-layer metal sheet of claim 12 .
14. The multi-layer metal sheet of claim 12 , wherein the alloy exhibits the formation of a dense precipitation band during brazing which contains Si content up to 0.5 wt. % in the core alloy.
15. The multi-layer metal sheet of claim 14 , wherein the difference in corrosion potential between the dense precipitation band and core (vs. Standard Calomel Electrode (SCE)) is between 30 to 40 mv.
16. The multi-layer metal sheet of claim 12 , comprising a minimum yield strength of about 71 MPa and ultimate tensile strength of about 182 MPa, measured after brazing.
17. The multi-layer metal sheet of claim 12 , comprising a corrosion potential of −670 mV or less in the core, measured after brazing.
18. The multi-layer metal sheet of claim 12 , wherein the alloy withstands at least 28 days without perforation during airside corrosion testing after brazing.
19. A heat exchanger comprising the multi-layer metal sheet of claim 12 .