| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy clad material which gives a tube for heat exchangers having excellent corrosion resistance of the outer surface when formed into a tube.SOLUTION: An aluminum alloy clad material comprises a three-layer structure in which an inner skin material is cladded on one side of a core and a sacrificial anode material is cladded on the other side. The core is composed of an Al-Mn-Cu alloy comprising 0.6-2.0% Mn, 0.03-1.0% Cu and remaining aluminum and unavoidable impurities. The sacrificial anode material is an Al-Zn-Cu alloy comprising 0.5-6.0% Zn, 0.03-0.3% Cu and remaining aluminum and unavoidable impurities. The inner skin material is an Al-Mn-Cu alloy comprising 0.6-2.0% Mn, 0.2-1.5% Cu and remaining aluminum and unavoidable impurities. The Cu amounts, %, of the core, the inner skin material and the sacrificial anode material meet the condition: (Cu% of the sacrificial anode material)≤(Cu% of the core)≤(Cu% of the inner skin material). The aluminum alloy clad material may have a two-layer structure consisting of the core and the sacrificial anode material. |
