Improvement of the corrosion resistance of alumina–chromia ceramic materials in molten slag

Abstract

Abstract In the previous study, we found out that the corrosion of ceramic materials in molten slag depended strongly on the viscosity of the slag and the basicity gap between the ceramics and the slag. In this study, we propose experimental equation to predict the corrosion rate of a ceramic material in a molten slag as functions of the viscosity and the basicity gap on the basis of the corrosion tests. Cr2O3–Al2O3 ceramic materials were used for the tests in the SiO2–CaO–B2O3 based model molten slag. The obtained experimental equation is as follows: logΔ D=0.18 ∗ log Δ B−0.55 ∗ log η+C where, ΔD is the depth of corrosion (μm), ΔB the basicity gap between the slag and specimen, η the viscosity of slag (Poise). C is the constant that depends on the conditions of the corrosion. The value is 2.7 for the testing temperature of 1573 K, holding time of 3600 s and rotating speed of specimen of 5.2 cm s−1 within this corrosion test.