Hot corrosion behaviour of a directionally solidified Ni-based superalloy CM 247 LC has been investigated. Weight gain experiments in still air were conducted to understand the effect of different corrodents on the alloy specified. The experiments were conducted for lOOh at 700, 850 and 900°C. The corrodents used were 75% Na2SO4 + 25% NaCl and 60% Na2SO4+30% NaVO3+10% NaCl. Uncoated samples were used for oxidation studies. Microstructural changes were analyzed using optical microscopy. The surface morphology of corrosion products was studied using SEM. The preliminary plain oxidation tests suggest that the oxidation kinetics follows the parabolic rate law. At 850°C, the 75%Na 2SO4+25%NaCl coated sample showed linear kinetics and after 80h breakaway oxidation occurred. In the case of 60% Na2SO 4+30%NaVO3+ 10%NaCl at 850°C linear kinetics lasted up to 20h only. The sudden increase in rate was due to the formation of Cr 2O3-NiO-V2O5. Formation of nickel vanadates resulted in reduced corrosion rate. At 900°C, corrosion layers of both the coated samples spalled off resulting in weight drop after 30h. The extensive corrosion in the prescence of salt deposits was attributed to the formation of low melting eutectics like Ni-Ni3S2 and NiO-Cr2O2-V2O5. From microstructural and XRD studies, formation of nickel vanadates and sulphides were confirmed.