PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving brazing property of a header pipe and a flat tube, and corrosion resistance by uniformly forming a sacrificial anticorrosion layer around an insertion hole of the header pipe, and to provide a manufacturing method of the heat exchanger capable of easily forming the optimum sacrificial anticorrosion layer according to brazing conditions, the shape of the heat exchanger and applications.;SOLUTION: In an aluminum heat exchanger including a pair of header pipes 11, 12 composed of an aluminum formation material, and a plurality of flat tubes 2 inserted and joined to insertion holes 13 formed on the header pipes 11, 12 at both end portions, the header pipes 11, 12 are coated with brazing filler metal sheets 20 on surfaces of the header pipes 11, 12, the insertion holes 13 are formed through the brazing filler metal sheets 20, and Zn-substituted flux 30 is applied to the surfaces of the header pipes 11, 12 coated with the brazing filler metal sheets 20.;SELECTED DRAWING: Figure 8;COPYRIGHT: (C)2019,JPO&INPIT
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