In general aluminum casting alloys (AC4C, etc.), alloying elements (Si, Mg, Cu, etc.) are added
in order to achieve both castability and strength.
On the other hand, pure aluminum (97% or more Al) has excellent corrosion resistance, ductility,
and anodizing properties due to the fact that they have fewer added elements compared to general alloys.
However, it has the disadvantage of inferior castability and strength compared to general alloys.
The table below compares general aluminum casting alloys with pure aluminum.