The invention relates to an automobile heat dissipation fin
aluminum foil prepared from an aluminum
alloy XR348. The aluminum
alloy XR348 is prepared from the following components: 1.1 to 1.4 weight percent of
manganese, 1.0 to 1.2 weight percent of
silicon, 0.9 to 1.1 weight percent of iron, 0.8 to 1.0 weight percent of
zinc, 0.21 to 0.30 weight percent of
zirconium, 0 to 0.05 weight percent of
titanium, 0 to 0.03 weight percent of
copper, 0 to 0.01 weight percent of
magnesium, 0 to 0.03 weight percent of a single unavoidable
impurity, 0 to 0.10 weight percent of all unavoidable impurities and the balance of aluminum. The preparation method of the automobile heat dissipation fin
aluminum foil comprises a step of performing
continuous casting-rolling on the aluminum
alloy XR348, so as to obtain the automobile heat dissipation fin
aluminum foil. The preparation method disclosed by the invention is short in flow and high in quality; after being subjected to high-temperature
soldering, the aluminum foil is extremely high in postwelding strength and high in
corrosion resistance;
diffusion of
silicon atoms on a soldered layer can be prevented, so that the hang-down resistance property of a material is improved; therefore, the aluminum foil and the preparation method which are disclosed by the invention are extremely high in performance.