Effect of Colloid Zirconia on Corrosion Resistance of Low Cement Alumina Mortar under Arc Furnace Slag

The purpose of this project is to improve the corrosion resistance of alumina base low-cement and ultra-low cement mortar against arc furnace slag. For this purpose, calcium aluminate cement was replaced by 1, 2 and 4 wt.% colloidal zirconia. Andreasen coefficient of 0.23 was chosen as a reference sample using 5% cement. Density, porosity and corrosion resistance of samples sintered at a temperature of 1620°C were measured. Microstructural investigations X-ray were also done by diffraction (XRD) and scanning electron microscopy (SEM). Results were show that the samples which contain colloidal zirconia have higher porosity lead to the more penetration of slag. Corrosion resistance was improved by 2 wt.% colloidal zirconia.