Aluminium alloy for use as core material in brazing sheet
AssigneeCorus Aluminium Walzprodukte GmbH
InventorsJeroen Andreas Helmuth Söntgerath, Achim Bürger, Klaus Vieregge
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Abstract
An aluminium alloy for use as a core material in brazing sheet, comprising, in weight %: Mn 0.7-1.5, Cu 0.6-1.0, Fe not more than 0.4, Si less than 0.1, Mg 0.05-0.8, Ti 0.02-0.3, Cr 0.1-0.25, Zr 0.1-0.2, balance Al and unavoidable impurities, wherein 0.20<(Cr+Zr)≦0.4, the alloy being capable of obtaining in the post-brazing state 0.2% yield strength of at least 65 MPa and having a corrosion life of more than 11 days in a SWAAT test without perforations in accordance with ASTM G-85.
Claims10
A brazing sheet comprising an aluminium alloy for use as a core material in the brazing sheet, the core material having a high corrosion resistance in the absence of a sacrificial anode coating layer, comprising, in weight %:
- Mn 0.7-1.5 Cu 0.6-1.0 Fe not more than 0.4 Si at most 0.08 Mg 0.05-0.8 Ti 0.02-0.09 Cr 0.1-0.25 Zr 0.1-0.2
- wherein 0.20<(Cr+Zr)≦0.4,
- wherein the core has no coating layer for acting as a sacrificial anode in contact with water, the alloy being capable of obtaining in the post-brazing state 0.2% yield strength of at least 65 MPa and having a corrosion life of more than 11 days in a SWAAT test without perforations in accordance with ASTM G-85.
A brazing sheet comprising an aluminium alloy for use as a core material in the brazing sheet, the core material having a high corrosion resistance in the absence of a sacrificial anode coating layer, consisting of, in weight %:
- Mn 0.7-1.5 Cu 0.6-1.0 Fe not more than 0.4 Si at most 0.08 Mg 0.05-0.8 Ti 0.02-0.09 Cr 0.1-0.25 Zr 0.1-0.2 balance Al and unavoidable impurities
- wherein 0.20<(Cr+Zr)≦0.4,
- wherein the core has no coating layer acting as a sacrificial anode in contact with water, the alloy being capable of obtaining in the post-brazing state 0.2% yield strength of at least 65 MPa and having a corrosion life of more than 11 days in a SWAAT test without perforations in accordance with ASTM G-85.
Dependencies are inferred from the claim text.