Corrosion of magnesia-chrome refractory by CaO-SiO2-Al2O3-FetO slag-metal system has been examined at 1600℃ in argon atmosphere. Results obtained are summarized as follows :
1)Main corrosion mode of magnesia-chrome refractory by molten CaO-SiO2-Al2O3-FetO slag and metal in static condition is the local corrosion at slag-metal interface.
2)Local corrosion rate at slag-metal interface increases with increasing iron oxide (Fe2O3) content of magnesia-chrome specimen and carbon concentration of metal,and decreasing iron oxide(T.Fe) concentration of slag.
3)Concentration gradient of iron oxide (T.Fe),MgO and Cr2O3 in slag phase,and the gradient of oxygen in metal phase along the slag-metal interface due to the dissolution of iron oxide(Fe2O3),MgO,and Cr2O3 from the refractory specimen,cause the interfacial tension gradient along the interface in vicinity of the local corrosion zone of refractory specimen,and in tum results in Marangoni convection in this area.
4)The Marangoni convection acceleratesthe mass transfer of dissolved component from the specimen. It results in the occurrence of local corrosion.