The invention provides a preparation method of an aluminum
alloy for an
aerosol bottle cap. The method comprises the steps of S1, preparing a cast
ingot through
alloy components based on the
mixing ratio; S2, milling the cast
ingot; S3, uniformly thermally
processing the cast
ingot; S4, performing hot rolling on the
cast iron to obtain a blank; S5, performing cold rolling to the blank which is subjected to hot rolling until the intermediate annealing thickness is reached; S6, washing the surface with weak alkali; S7, completely recrystallizing and annealing the middle; S8, performing pass rolling on a finished product; S9, stably chemically
processing the finished product; and S10, stretching and bending and correcting back roll. According to the method, the Na content is effectively decreased based on the component
mixing ratio and the technical method; the range of Na element which easily causes Na
embrittlement in a high-
magnesium alloy is avoided, and thus the problem of Na
embrittlement is solved; and meanwhile, the component fluctuation is well controlled, and the problem that the
magnesium element easily results to
slag inclusion is solved; and meanwhile, the problem of liquid leaking caused by impurities adhering to the surface can be solved by a special weak alkali washing technology in the middle process; and the produced aluminum alloy for the
aerosol bottle cap is high in stability in batch.