ALUMINUM ALLOY FOR HEAT EXCHANGER FIN MATERIAL EXCELLENT IN THERMAL CONDUCTIVITY AFTER BRAZED AND SACRIFICIAL ANODE EFFECT

摘要

PURPOSE:To evade the deterioration in the strength after brazed and thermal conductivity of the aluminum alloy and to offer the aluminum alloy for a heat exchanger fin material by regulating an Al Fe series alloy having specified compsn. as an Al alloy to which Zn and Zr are added instead of an Al-Mn series alloy. CONSTITUTION:The Al alloy for a heat exchanger fin material contains, by weight, 0.8 to 1.8% Fe, 0.05 to 0.20% Zr, 0.3 to 2.0% Zn and the balance Al. In the alloy, Fe improves the strength before or after brazed. Since the alloy contains no Mn, =0.8% Fe is needed for improving the strength; the more Fe is incorporated, the more the strength is improved, so that =1% is preferable; but, in the case of 1.8%, coarse crystallized products are formed at the time of casting to make the manufacture of steel sheets difficult. Furthermore, Zr improves the high temp. buckling resistance, and Zn changes the potential into a base one to provide it with sacrificial anode effect.