High temperature designing needs to material which can be resistive against the hot corrosion. Because of the perfect resistance against corrosive environments, Nickel based alloys (a group of super alloys) have a lot of applications particularly at high temperatures. Inconel 625 is one of these alloys, which is applicable in many industries for its high strength and corrosion resistance. These alloys have suggested for application in solar power stations. One of the common usable salts for the solar power stations is molten salt with composition of 40%KNO 3 -60%NaNO 3 , which are usable in a liquid state for a wide range of high temperature applications. For these industries, the molten salts are used for adsorption and maintenance of the sun conducted heat. In addition, there is little information about hot corrosion behavior of these super alloys. So, this research investigates hot corrosion behavior of Inconel 625 in molten salt with composition of 40%KNO 3 -60%NaNO 3 , using weight loss measurements, electrochemical tafel polarisation, cyclic polarisation and electrochemical impedance spectroscopy (EIS). For this purpose, an electrochemical cell containing a heat-transition system was designed. Weight loss measurements for determining the oxidation kinetic at 500 and 600 , and electrochemical tafel polarisation tests for both 500 and 600 were carried out. The effect of NaNO 3 inhibitor on the polarisation curves was also evaluated at 600 . Moreover, the cyclic polarisation tests and the EIS measurements in open circuit potential at both temperatures were performed. The weight loss measurements shown that oxidation procedure of Inconel 625 is a diffusion controlled reaction and follows from parabolic rule, where with increasing temperature, the oxidation rate is increased. Based on the tafel polarisation curves, it was demonstrated that half-cell reduction reaction is under activation energy control and half-cell oxidation reaction is under diffusion control. However, it was detected that with increasing temperature the polarisation curve is shifted toward the right side. NaNO 3 inhibitor used at 0.01, 0.03, 0.1, 0.3 mol/kg concentrations At 600 , NaNO 3 inhibitor at 0.1 mol/kg concentration had the best efficiency and as a result, it increased the pitting corrosion resistance and prohibited form pit nucleation. Conducted cyclic polarisation test shown a positive residual loop and confirmed the presence of pits. At 500 and 600 , EIS measurements depicted two distinctive loops. The first in the high frequencies was attributed to the corrosion procedure and the second was related to the limited diffusion procedure for the molten nitrated salt. Keywords : Inconel 625, nitrated salts, hot corrosion, pitting corrosion, inhibitor