US 12,287,161 B2
Aluminum alloy heat exchanger
Tomohiro Shoji, Tokyo (JP); Yoshihiko Kyo, Tokyo (JP); Atsushi Fukumoto, Tokyo (JP); Yoshiyuki Oya, Tokyo (JP); Takahiro Shinoda, Kariya (JP); Koichi Nakashita, Kariya (JP); and Naoto Goto, Kariya (JP)
Assigned to UACJ CORPORATION, Tokyo (JP); and DENSO CORPORATION, Kariya (JP)
Appl. No. 17/056,645
Filed by UACJ Corporation, Tokyo (JP); and DENSO CORPORATION, Kariya (JP)
PCT Filed May 17, 2019, PCT No. PCT/JP2019/019759
§ 371(c)(1), (2) Date Nov. 18, 2020,
PCT Pub. No. WO2019/225511, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 2018-097300 (JP), filed on May 21, 2018.
Prior Publication US 2021/0199395 A1, Jul. 1, 2021
Int. Cl. F28F 21/08 (2006.01); F28D 1/053 (2006.01); F28F 1/02 (2006.01); F28F 1/12 (2006.01)
CPC F28F 21/089 (2013.01) [F28D 1/0535 (2013.01); F28F 1/022 (2013.01); F28F 1/126 (2013.01); F28F 21/084 (2013.01); F28F 2215/00 (2013.01); F28F 2275/04 (2013.01)] 2 Claims
OG exemplary drawing
 
1. An aluminum alloy heat exchanger with an atmosphere side used in a dilute chloride ion environment of 1,000 ppm or less, the aluminum alloy heat exchanger being formed by brazing a tube and an aluminum fin, the tube being formed of a tube aluminum alloy clad two-layer material consisting of two layers formed of a core material formed of an aluminum alloy and a sacrificial anode material cladded onto one side surface of the core material such that the core material serves as a coolant passage side and the sacrificial anode material serves as the atmosphere side, wherein
the core material is formed of an aluminum alloy comprising Mn of 0.60 to 2.00 mass % and Cu of 1.00 mass % or less, and optionally one or two or more of Si of 1.50 mass % or less, Fe of 0.70 mass % or less, and Ti of 0.01 to 0.30 mass %, with the balance being Al and inevitable impurities,
the sacrificial anode material is formed of an aluminum alloy comprising Zn of 2.50 to 10.00 mass %, and optionally one or two or more of Si of 1.50 mass % or less, Fe of 1.50 mass % or less, and Mn of 1.50 mass % or less, with the balance being Al and inevitable impurities,
pitting potential of a sacrificial anode material surface of the tube of the aluminum alloy heat exchanger in a 5% NaCl solution is −800 (mV vs Ag/AgCl) or less, and
pitting potential of the aluminum fin of the aluminum alloy heat exchanger in a 5% NaCl solution is less than the pitting potential of the sacrificial anode material surface of the tube of the aluminum alloy heat exchanger in a 5% NaCl solution.