Reduction of Fe concentration in Al–4Si–1Fe–1Cu–0.5Zn–0.5Mn alloys with S

摘要

In this article,the effect of sulfur on the reduction of Fe concentration in aluminum alloy scraps was investigated.The iron content decreases from1.224 wt% to 0.854 wt% and achieves an optimal ratio of30 % when the sulfur addition is 3 %.Thermodynamic calculations,the X-ray diffraction(XRD),scanning electron microscope(SEM),and differential scanning calorimetry(DSC)analyses of the sample indicate that the formation of Fe S can occur spontaneously in molten aluminum with the addition of sulfur.The mechanism of Feremoving purification process was also discussed.