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The effects of T6 heat treatment and 0.6 wt% (Pr+Ce) addition onmicrostructure,microhardness, and corrosion of AlSi5Cu1Mg alloywere investigated. Opticalmicroscopy and scanning electron microscopy revealed that the T6 heat treatment and the addition of 0.6 wt% (Pr+Ce) effectively refined theα-Al and eutectic Si phases, whichwere uniformly distributedwithAl2Cu phase in the alloy.Microhardness, weight loss, hydrogen evolution, Tafel polarization, and EIS tests showed that the combination of T6 heat treatment and 0.6 wt% (Pr+Ce) addition resulted in the best corrosion resistance andmicrohardness of the alloy. Themicrohardness of theAlSi5Cu1Mg+0.6 wt% (Pr+Ce)/T6 (115HV)was 27.8%higher than that of thematrix (90HV). At the same time, the corrosion current density of the alloy also reached theminimumvalue (38.4μAcm). The T6 heat treatment and the addition of (Pr+Ce) can significantly decrease the average grain size, change the redistribution of the precipitated Al2Cu phase, refine the Si phase, and increase the pitting formation position, thus reducing the sensitivity of exfoliation corrosion.

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy