Corrosion behavior of MgO-MgAl2O4-FeAl2O4 composite refractory materials

This paper investigated the corrosion behavior of refractory materials that were produced by incorporating hercynite (FeAl2O4, H) at different ratios into MgO-MgAl2O4 (spinel, S). Meanwhile, the values of density and open porosity of those samples were also measured. The corrosion resistance of those composite refractory materials was determined by measuring the penetration distances and spreading areas. The influence of corrosion resistance based on the microstructural changes occurred as a result of solubility of constituents in the interface of clinker-refractory for different regions was examined by using SEM. The incorporation of FeAl2O4 into MgO-MgAl2O4 decreased the porosity of composite refractory materials and also reduced the penetration distances and spreading area values of the corroded regions of refractories, leading to improvement on the corrosion resistance. The optimum amounts of constituents incorporated into new composite refractory materials used for obtaining longer service life in industrial applications were determined.