Title:
ALUMINUM ALLOY HEAT EXCHANGER
Document Type and Number:
Japanese Patent JP2023078936
Kind Code:
A
Abstract:
To provide a heat exchanger capable of attaining brazability improvement effect by addition of Bi while restraining deterioration of corrosion resistance due to the addition of Bi.SOLUTION: An aluminum alloy heat exchanger 1 is manufactured by being joined by brazing with heat in an inert gas atmosphere without using flux. A refrigerant passage pipe 2 is made of a clad material prepared by cladding a core material with a sacrifice anode material 22. A fin 3 is made of a clad material prepared by cladding a core material with a brazing material consisting of an aluminum alloy containing Si and Bi. The sacrifice anode material 22 and the fin 3 are brought into contact with each other and joined by brazing. A pitting potential Ef of a surface of the fin 3 and a pitting potential Es of a surface of the sacrifice anode material 22 of the refrigerant passage pipe 2 have the following relations (1) to (3), (1) the pitting potential Ef≥the pitting potential Es, (2) the pitting potential Es≥-830 mV (vs Ag/AgCl), (3) the pitting potential Ef≥-780 mV (vs Ag/AgCl).SELECTED DRAWING: Figure 1
Inventors:
KOMICHI TOMOHIRO
NAKAMURA SHINICHI
YAMAYOSHI TOMOKI
SUZUKI TAICHI
IDE TATSUYA
YAMADA SHOGO
SAJI ATSUSHI
HOMMA NOBUHIRO
UCHIDA YOSUKE
NAKAMURA SHINICHI
YAMAYOSHI TOMOKI
SUZUKI TAICHI
IDE TATSUYA
YAMADA SHOGO
SAJI ATSUSHI
HOMMA NOBUHIRO
UCHIDA YOSUKE
Application Number:
JP2021192276A
Publication Date:
June 07, 2023
Filing Date:
November 26, 2021
Export Citation:
Assignee:
UACJ CORP
DENSO CORP
DENSO CORP
International Classes:
B23K35/22; F28F21/08; B23K35/28; C22C21/00; F28F1/32; F28F19/06
Attorney, Agent or Firm:
Patent Attorney Corporation Aichi International Patent Office
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