Corrosion resistance and interfacial morphologies of novel Fe-Cr-Mo-B cast steels in molten aluminum

The corrosion resistance and interfacial morphologies of novel Fe-Cr-Mo-B cast steels in molten aluminum have been studied. The result indicates that borides, especial the primary Cr-rich Fe2B, play a key role in improving the corrosion resistance of Fe-Cr-Mo-B cast steels. They are embedded in the intermetallics (corrosion products of the Fe substrate) and act as root to prevent the intermetallics from falling off effectively. The corrosion resistance of Fe-Cr-Mo-B cast steel in molten aluminum is 5 times higher than that of H13.