| 摘要 |
Provided is an aluminum alloy tube which exhibits excellent corrosion resistance and which has a joining layer for brazing. Also provided is a heat exchanger provided with fins which are made using not a brazing sheet but an inexpensive and easily available bare material. A process for producing an aluminum alloy tube, including: a step for arc-spraying Zn having a purity of 95% or higher on the surface of an aluminum alloy tube under the conditions of spray weight of 3 to 10g/m2 and spray rate of 150×103 to 350×103 mm/sec to form a Zn-containing sacrificial anticorrosion layer; and a step for applying a joining material for brazing, said joining material consisting of a mixture obtained by mixing Si powder having a purity of 95% or higher with a flux, onto the surface of the sacrificial anticorrosion layer with the amount of the Si powder applied being adjusted to 1.2 to 3.0g/m2, and thereby forming a joining layer for brazing. |
