Patent ID: 6294272
Filing Date: 2001-09-25
Classification: B23K,C22C,F28F,Y10T

Abstract:
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 0.1-0.2wherein 0.20<(Cr+Zr).ltoreq.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.