In order to improve the corrosion resistance of aluminosilicate refractories by molten aluminum, SrSO 4 and BaSO 4 powders were used. Mullite substrates with and without addition of 20wt.% SrSO 4 or BaSO 4 were sintered at 1400°C for 6h. Corrosion and wetting experiments with molten pure Al and Al–7.5Si were carried out at 900°C for 24h and 900°C for 2h, respectively. The corrosion layer was thicker in the mullite sample (≥2mm) than that of the SrSO 4 - or BaSO 4 -containing mullite samples (<50μm). The contact angles for mullite samples containing SrSO 4 or BaSO 4 were higher (≈118° and 149°) than those of the mullite sample (≈109° and 127°), with both pure aluminum and Al–7Si alloy. This increase in the contact angle improves the corrosion resistance in mullite samples by means of non-wetting effect.