Aluminum extruded flat multi-hole tube excellent in brazing and outer surface anticorrosion properties, and aluminum heat exchanger using the same

摘要

Advantageously imparting excellent brazing properties and excellent external corrosion resistance at the outer peripheral portion of an aluminum extruded flat multi-hole tube. An aluminum extruded flat multi-hole tube formed by simultaneous extrusion using an aluminum tube main body material and a sacrificial anode / brazing material made of an Al-Si-Zn-based aluminum alloy, which is electrochemically lower than that. In 10, the sacrificial anode / brazing material portion 18 was formed by exposing the sacrificial anode / brazing material to the entire region of the tube outer peripheral wall portion or at least a part of the flat portion of the tube outer peripheral wall portion.