Aluminum alloy heat exchanger and method of producing the same

摘要

An aluminum alloy heat exchanger having a tube composed of a thin aluminum alloy clad material, wherein, in the clad material, one face of an aluminum alloy core material containing Si 0.05-0.8 mass% is clad with an Al-Si-series filler material containing Si 5-20 mass%, and the other face is clad with a sacrificial material containing Zn 2-10 mass% and/or Mg 1-5 mass%, and wherein an element diffusion profile of the clad material by EPMA satisfies (1) and/or (2): L-LSi-LZn≥40 ( mu m) L-LSi-LMg≥5 ( mu m) wherein L is a tube wall thickness ( mu m); LSi is a position ( mu m) indicating an amount of Si diffused from the filler material; and LZn and LMg each represent a region ( mu m) indicating an amount of Zn or Mg diffused from the sacrificial material, respectively. A method of producing the heat exchanger.