This paper is devoted to the evaluation of the corrosion be-havior of Alloy 800 (UNS N08800) when exposed to 80 mol% Na 2 SO 4 -20V 2 O 5 (80 mol% sodium sulfate-20vanadium pentoxide; high sulfate) and 80 mol% V 2 O 5 -20Na 2 SO 4 (high vanadate) at 700°C and 900°C. Applying electrochemical techniques, namely potentiodynamic polarization curves that led to the calculation of Tafel slopes and the electrochemical noise technique (ENT), corrosion rates and the type of corro-sion (localized or generalized) attack was determined by ENT and compared with conventional weight-loss methods. A sta-tistical and spectral noise analysis of noise-time records was performed, providing the noise resistance, pitting index, and noise impedance. The results showed that Alloy 800 is liable to suffer localized corrosion when it is exposed to molten salt solution high in sulfate at 700°C and 900°C, showing a higher degree of localized attack at the higher temperature. When exposed to the vanadium-rich solution, a more general-ized corrosion was observed at both temperatures. Compari-son of mass loss obtained with electrochemical noise measurements is in agreement. The pitting index proved to be an indicator for the type of corrosion observed.