Wetting and corrosion behavior of V– and Ti–containing slag on oxidation layer of MgO–C refractory

Abstract

In this study, the wetting and corrosion behavior of slags containing vanadium (V) and titanium (Ti) on the oxidized surface of MgO–C refractory (MO), were investigated. The microstructures and phase compositions were analysed at the interface between the slag and MO substrates, alongside an examination of the corrosion mechanism. The findings unveiled that adding V₂O₃ and TiO₂, whether individually or in tandem, reduced the slag’s melting point and the contact angle between the slag and MO substrate. The molten slags mainly penetrated the MO substrates through pores, cracks, and grain boundaries, forming silicate, and vanadate phases at the slag–MO interface. In particular, the V–containing slag demonstrated stronger susceptibility to corrode the MO substrate due to the capacity of V to form low–melting point phases with MgO. This led to deeper penetration and a larger corroded area within the substrate. These findings offer valuable insights for the design and optimization of slags containing V and Ti and MgO–C refractory materials in metallurgical processes.