Aluminum alloy heat transfer tube for open rack type vaporizer and its manufacturing method and open rack type vaporizer

摘要

PROBLEM TO BE SOLVED: To provide a heat conducting aluminum alloy pipe for an open rack vaporizer, which ha a sacrificial anode layer having an excellent durability on its surface, and the open rack vaporizer.SOLUTION: A heat conducting aluminum alloy pipe for an open rack vaporizer comprises heat conducting pipe base material which is made of aluminum alloy and has a plurality of fins parallel with longitudinal direction of a peripheral surface and a sacrificial anode layer formed on an outer surface of the heat conducting pipe base material. The sacrificial anode layer contains Zn: 0.5 to 2.0% (mass%, the same is applied hereinafter), Fe:0.2 to 0.5%, and Al and inevitable impurities as remaining contents. The sacrificial anode layer has a metal structure that crystal particle diameter is 1000 μm or less. It is preferable that the sacrificial anode layer has a thickness of 0.005 mm or more and 5 mm or less.SELECTED DRAWING: Figure 1