Title:
HEAT EXCHANGER
Document Type and Number:
Japanese Patent JP2019045091
Kind Code:
A
Abstract:
To provide a heat exchanger which is excellent in the corrosion resistance of a heat exchange pipe.SOLUTION: A capacitor being a heat exchanger comprises a plurality of aluminum-extrusion shape material heat exchange pipes, and aluminum bare material fins which are arranged between the adjacent heat exchange pipes, and joined to the heat exchange pipes by brazing materials. A pipe wall 30 of the heat exchange pipe is composed of a main body part 31 composed of an Al alloy for forming an aluminum-extrusion shape material, and a coating layer 32 composed of an AI-Si-Zn alloy, and covering an outer face of the main body part 31. A diffusion layer 33 in which Zn and Si in the Al-Ai-Zn alloy for forming the coating layer 32 are diffused is formed at an outer surface layer part of the main body part 31 of the pipe wall 30. In a range between an outermost face of the pipe wall 30 of the heat exchange pipe, and the deepest part of the diffusion layer 33, there exist a low-potential portion in which natural potential in the range is the lowest, and a high-potential portion in which natural potential in the range becomes higher than the low-potential portion by 60 mV or higher so that the low-potential portion is located at the outermost face of the pipe wall 30.SELECTED DRAWING: Figure 2
Inventors:
TAKAHASHI KAZUYUKI
OTSUKI TAKUSHI
KOBAYASHI MANA
OTSUKI TAKUSHI
KOBAYASHI MANA
Application Number:
JP2017169933A
Publication Date:
March 22, 2019
Filing Date:
September 05, 2017
Export Citation:
Assignee:
KEIHIN THERMAL TECHNOLOGY CORP
International Classes:
F28F19/06; B23K1/00; B23K1/19; C22C21/00; F28F21/08
Domestic Patent References:
| JP2016223725A | 2016-12-28 | |||
| JP2009068083A | 2009-04-02 | |||
| JP2011137203A | 2011-07-14 | |||
| JP2004330233A | 2004-11-25 | |||
| JP2009179830A | 2009-08-13 | |||
| JP2014238209A | 2014-12-18 |
Foreign References:
| US20140033534A1 | 2014-02-06 |
Attorney, Agent or Firm:
Matsumura Naoto
Akira Watanabe
Einosuke Kishimoto
Akira Watanabe
Einosuke Kishimoto