Process for producing aluminum alloy tube having sacrificial anticorrosion layer and joining layer

Patent metadata

Field	Value
Publication number	US-9631878-B2
Application number	US-201214371142-A
Country	US
Kind code	B2
Filing date	Aug 1, 2012
Priority date	Aug 1, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Provided is an aluminum alloy tube with superior corrosion resistance and a joining layer for brazing. In addition, a heat exchanger using a fin which utilizes a bare material of low cost and higher availability, rather than a clad material, is provided. A manufacturing method of an aluminum alloy tube, including the steps of forming a sacrificial anticorrosion layer comprising Zn, by ark spraying Zn with purity of 95% or more, onto a surface of aluminum alloy tube with a spraying amount of 3 to 10 g/m 2 and a spraying speed of 150×10 3 to 350×10 3 mm/sec; and forming a joining layer for brazing by applying a joining material for brazing comprising a mixture obtained by mixing Si powder with purity of 95% or more and flux, onto a surface of the sacrificial anticorrosion layer, so that the amount of the Si powder is 1.2 to 3.0 g/m 2 , is provided.

First claim

The invention claimed is:

1. A manufacturing method of an aluminum alloy tube, comprising the steps of:
forming a sacrificial anticorrosion layer comprising Zn, by ark spraying Zn with purity of 95% or more, onto a surface of aluminum alloy tube with a spraying amount of 3 to 10 g/m 2 and a spraying speed of 150×10 3 to 350×10 3 mm/sec; and
forming a joining layer for brazing by applying a joining material for brazing comprising a mixture obtained by mixing Si powder with purity of 95% or more and flux, onto a surface of the sacrificial anticorrosion layer, so that the amount of the Si powder is 1.2 to 3.0 g/m 2 .

2. The manufacturing method of claim 1 , wherein:
the flux is a fluoride flux including a compound of K, Al, and F; and
a formulation ratio of the Si powder and the flux is 1:3 to 1:2.

3. The manufacturing method of claim 1 , wherein:
a particle diameter of the Si powder is 50 μm or less; and
a proportion of Si powder having a particle diameter of 1.0 to 7.0 μm is 50% or more.

4. The manufacturing method of claim 3 , wherein the sacrificial anticorrosion layer is formed by spraying Zn onto a surface of an extruded aluminum alloy at the temperature of 450° C. or higher.

Assignees

• Mori Kensuke
• Uacj Corp

Inventors

• Mori Kensuke

Classifications

• B23K35/404

  Coated rods; Coated electrodes · CPC title

• B23K35/40 Primary

  Making wire or rods for soldering or welding · CPC title

• C23C24/082

  without intermediate formation of a liquid in the layer · CPC title

• C23C4/131

  Wire arc spraying · CPC title

• F28F1/022

  with multiple channels · CPC title