ALUMINUM ALLOY BRAZING SHEET FOR VACUUM BRAZING

摘要

PROBLEM TO BE SOLVED: To provide a brazing sheet for a vacuum brazing with which the brazing sheet itself and a heat exchanger and the like for which the brazing sheet is used show an excellent external corrosion resistance even when a thin plate is used. SOLUTION: The brazing sheet made of an aluminum alloy for a vacuum brazing with a thickness not greater than 0.45 mm uses an aluminum alloy containing >=0.5 wt. % to <2 wt.% Mn and >=0.1 wt.% to <1 wt.% Cu as a core material, one side of the sheet is coated with an aluminum alloy containing >=0.5 wt.% to < 2 wt.% Mn and <0.05 wt.% Sn as a intermediate layer with a thickness of >=30μm and <100μm, the face having the intermediate layer is coated with an Al-Si-Mg-based alloy brazer layer containing >=0.001 wt.% to <0.05 wt.% Sn with a thickness of >=60μm to <=100μm, and the face having no intermediate layer is coated with an Al-Si-Mg-based alloy layer with a thickness of >=60μm to <=100μm.