Title:
ALUMINUM ALLOY EXTRUDED TUBE AND HEAT EXCHANGER
Document Type and Number:
WIPO Patent Application WO/2022/050030
Kind Code:
A1
Abstract:
An extruded tube of an aluminum alloy and for a heat exchanger and characterized by having a tube body comprising an aluminum alloy containing Mn, a Zn thermal sprayed layer formed on the outer surface of the tube body, and a coating film formed on the outer surface of the Zn thermal sprayed layer, wherein the coating film contains an Al-Si alloy brazing material powder, a fluoride flux powder that does not include Zn, and a binder, and in a heating test for measuring the average crystal grain size after holding at 600°C ±10°C for three minutes and then cooling to room temperature, the average crystal grain size of the tube body after the heating test is 150 μm or greater. By means of the present invention, it is possible to provide an aluminum alloy extruded tube that is for a heat exchanger for an automobile and that enables fins and the tube to be joined without reducing the wall thickness of the tube during brazing, and that has excellent brazing ability, and for which the fins do not easily detach over a long period of time, and that has excellent corrosion resistance due to protection from corrosion provided by the fins.
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Inventors:
SUZUKI TAICHI (JP)
TOMORI RYO (JP)
KUMAGAI HIDETOSHI (JP)
TOMORI RYO (JP)
KUMAGAI HIDETOSHI (JP)
Application Number:
PCT/JP2021/029860
Publication Date:
March 10, 2022
Filing Date:
August 16, 2021
Export Citation:
Assignee:
UACJ CORP (JP)
International Classes:
B23K1/00; B23K1/19; C22C21/00; C23C4/08; C23C4/18; C23C28/00; F28F21/08
Domestic Patent References:
| WO2018147375A1 | 2018-08-16 |
Foreign References:
| JPH07278779A | 1995-10-24 | |||
| JPH11790A | 1999-01-06 | |||
| JP2013204070A | 2013-10-07 |
Attorney, Agent or Firm:
ASHITABA INTERNATIONAL PATENT OFFICE (JP)
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