Joining structure of brazing sheet for heat exchanger and brazing sheet for heat exchanger and heat exchanger

摘要

Problem to be solved: to prevent or prevent preferential corrosion of the fillet even if the fillet adjacent to the joint portion of the brazing sheet contains copper and zinc, and to improve the corrosion resistance of the heat exchanger.Solution: the brazing sheet 10 used in the heat exchanger comprises a core material 11 made of aluminum alloy, a brazing filler metal layer 12, and a sacrificial anode material layer 13 containing zinc, and has a joining surface 10a constituting the joint portion 21 and a non bonded adjacent surface 10b adjacent to the joining surface 10a.The bonding surface 10a is formed of the sacrificial anode material layer 13.A fillet 22 is formed between each non joining adjacent surface 10b adjacent to the joining surface 10a.The brazing filler metal and the sacrificial anode material do not contain copper, and the hearth 11 contains copper in the range of 0.3 to 1.2 mass%.Diagram