Abstract
In the present work, chemical attacks and corrosion behaviors of a used Al2O3-MgAl2O4 refractory castable in the non-tapping slag side of a refining ladle were investigated and also compared with that of the counterpart (in the tapping slag side). Corrosion microstructures revealed the stress cracks occurred on the corroded interface and just along the boundary between the infiltration layer and original layer, indicating the thermo-mechanical properties’ mismatch above those two layers was the main reason for the formation of cracks on the corroded interface. Furthermore, the corrosion process of Al2O3 aggregates on the interface was studied in detail, and an intergranular mechanism was proposed based on observed microscopic characteristics.
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