| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum heat exchanger capable of maintaining a long-term corrosion resistance by making an addition amount of Cu and a natural potential optimum and by using aluminum, in which corrosion shows surface corrosion tendency even without depending on a Zn diffusion layer, for a heat exchange tube.SOLUTION: An aluminum heat exchange tube 3 has a composition which contains, in mass%,: 0.05-0.20% of Fe; 0.10% or less of Si; 0.15-0.32% of Cu; 0.08-0.15% of Mn; 0.02-0.05% of Zr; 0.06-0.15% of Ti; 0.05% or less of V; 0.03% or less of Cr, and the balance comprises Al and unavoidable impurity. An aluminum corrugated fin 4, which comprises a brazing sheet in which a leather material 4b is cladded to both surfaces of a core material 4a, has a composition in which; the core material contains 1.3-2.2% of Zn; the leather material contains 0.7-1.3% of Zn; and the balance comprises Al and unavoidable impurity respectively. |
