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Six kinds of Cr2O3 Al2O3 fused grains ( the mass percent of Cr2O3 was 15% ,40% ,50% ,60% ,85% and 99% ,respectively) were prepared using chrome green and Al2O3 powder as starting materials by electrofusion,named as CR15,CR40,CR50,CR60,CR85, and CR99,respectively. The corrosion resistance of the six kinds of Cr2O3 Al2O3 fused grains ( 4 1 mm) was studied using rotary slag corrosion method. The results show that: ( 1) the corrosion resistance of the fused grains increases with the Cr2O3 content and the grain size increasing; ( 2) the grains of CR99 and CR85 with higher Cr2O3 content are corroded at the slag surface layer,because FeO and Al2O3 in the slag corrode the grains; FeO reacts with Cr2O3 in the aggregates forming ( Fe,Cr) 3O4 spinel firstly,and the spinel reacts with other phases forming composite spinel; when FeO is fully consumed,Al2O3 penetrated into the grains reacts with Cr2O3 forming Al2O3 Cr2O3 solid solution on the grains surface; ( 3) for CR60,the corrosion exists both in the slag surface layer and in the penetration layer; in the penetration layer,CaO and SiO2 react with Al2O3 in Al2O3 Cr2O3 solid solution forming anorthite, gehlenite, and glass phase; the grains of CR50,CR40 and CR15 have the same corrosion mechanism with CR60 in the penetration layer.
Six kinds of Cr2O3 Al2O3 fused grains (the mass percent of Cr2O3 was 15%, 40%, 50%, 60%, 85% and 99%, respectively) were prepared using chrome green and Al2O3 powder as starting materials by electrofusion, named as The results show that: (1) the corrosion of the six kinds of Cr2O3 Al2O3 fused grains (41 mm) was studied using a rotary slag corrosion method. (2) the grains of CR99 and CR85 with higher Cr2O3 content are corroded at the slag surface layer, because FeO and Al2O3 in the slag corrode the grains; FeO reacts with Cr2O3 in the aggregates forming (Fe, Cr) 3O4 spinel first, and the spinel reacts with other phases forming composite spinel; when FeO is fully consumed, Al2O3 impregnated with the grains reacts with Cr2O3 forming Al2O3 Cr2O3 solid solution on the grains surface; (3) for CR60, the corrosion exists both i the slag surface layer and in the penetration layer; the penetration layer, CaO and SiO2 react with Al2O3 in Al2O3 Cr2O3 solid solution forming anorthite, gehlenite, and glass phase; the grains of CR50, CR40 and CR15 have the same corrosion mechanism with CR60 in the penetration layer.