Corrosion Behavior of Austempered Ductile Iron in Molten Al

The corrosion behavior of austempered ductile iron (ADI) in molten aluminum (Al) is investigated in the present study. The results indicate that ADI demonstrates a superior corrosion resistance when exposed to molten Al for an extended period. The intermetallic compounds (IMCs) layer is primarily composed of Fe 2 Al 5 and FeAl 3 . The thickness of intermetallic layer decreases from 49 to 30 μm with the increase of corrosion time, in which the thickness of Fe 2 Al 5 decreases, while that of FeAl 3 remains relatively unchanged. This outcome is primarily attributed to the formation of fine graphite nodules resulting from the decomposition of ausferrite. Additionally, the formation of Fe–Al–Si compound at the interface of IMC and ADI impedes the diffusion of Al atoms into ductile iron.