| 摘要 |
PROBLEM TO BE SOLVED: To provide a brazing sheet for heat exchanger, excellent in corrosion resistance, particularly corrosion resistance to the propagation of corrosion in a sheet-thickness direction, capable of prolonging corrosion life to a greater extent than heretofore, and further preventing the occurrence of the situation where a corrosion-improving effect cannot be produced sufficiently owing to the erosion by a molten brazing filler metal at the time of brazing heating. SOLUTION: A a core material, a laminated core material 3, which has one or more couples 1 of noble layer and base layer, in which noble potential layer 1A and base potential layer 1B, adjacent to each other in a sheet thickness direction and having >=20mV potential difference and each having 1-30μm thickness, are coupled to each other, at least in either surface, is used. Further, an erosion-preventing layer 4 of 30-100μm thickness is interposed between the surface of the laminated core material 3, on the side where the couple 1 of noble layer and base layer is located, and a brazing filler metal 5.
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