The hot corrosion behavior of Fe40Al intermetallic alloyed with 2.5 at. % Ag in KCl-ZnCl2 (1:1M) at 450 °C has been studied and assessed by means of electrochemical techniques. Techniques included potentiodynamic polarization curves, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) measurements. Furthermore thermodynamic stability phase diagrams were calculated and elaborated in order to improve the understanding of the corrosion mechanism. Results have shown that addition of Ag increase the corrosion rate. Besides, corrosion potential of Fe-Al-Ag alloy resulted nobler. Ternary Fe-Al-Ag alloy exhibited a more noble corrosion potential but a bigger corrosion rate than the 304 SS specimen corroded under the same experimental conditions. Corrosion behavior is explained in terms of the stability of the corrosion products formed film.