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Incorporation of magnesia alumina spinel confers excellent thermal shock/spalling resistance, good slag resistance, high creep resistance and refractoriness, on calcium aluminate cement bonded corundum-magnesia alumina spinel (Al 2 O 3 -MgAl 2 O 4 ) refractory castables. [1][2][3][4] To date, they have been widely applied as lining materials in refining ladles, 1,5,6 Ruhrstahl Heraeus (RH) snorkels, 7-9 purging plug, 10 and slagging gasifiers, 11-12 etc.Their corrosion behaviors in the clean steel refining processes mentioned above have been extensively investigated. [13][14][15][16][17] Zhang and Lee studied the dissolution processes of fused and tabular corundum aggregates in a silicate slag, and observed the formation of calcium hexaaluminate (CA 6 ) and hercynitic spinel layers close to the Al 2 O 3 /slag interfaces, whose continuity and morphology varied, dominating the indirect or direct dissolution processes. 18 Cho et. al. investigated the corrosion behavior of three kinds of spinel clinkers (47, 69, 94 wt% Al 2 O 3 ) in a

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