| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy brazing sheet which has excellent corrosion resistance in a weld zone, and is useful for various structural members such as a tube for a heat exchanger. SOLUTION: The brazing sheet 3 having excellent corrosion resistance in a weld zone 5 is obtained by coating one side or both sides of a core material 1 containing, by mass, 0.1 to 0.5% Cu, 0.05 to 0.3% Ti and 0.3 to 1.5% Mn, <=0.2% Si, Fe and Mg, and the balance Al with inevitable impurities with an aluminum alloy brazing filler metal 2 in a cladding ratio of 10 to 20% per one side. The crystal grain diameter L in a rolling direction in the longitudinal face of the core material 1 is 150 to 200μm, the diffusion depth D of Cu in the weld zone 5 when subjected to brazing heating after welding is >=100μm, and the potential difference S between the surface of the brazing filler metal 2 in the weld zone 5 and the position at the inside by 100μm from the surface of the brazing filler metal 2 is >=50 mV.
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