EFFECT OF NACL ADDITION ON THE VOLTAGE NOISE CHARACTERISTICS DURING OXIDATION OF IRON IN NANO3-NANO2 MELT

Effect of NaCl addition on the oxidation of iron in NaNO3-NaNO2 melt a t 250 degrees C has been studied by electrochemical voltage noise anal ysis and harmonic current measurements. The voltage fluctuations, elec trochemical noise power and oxidation rate were tend to decrease with immersion time id the NaNO3-NaNO2 melt due to the growth of compact ox ide film. This trend was maintained even after the addition of 2% NaCl . However, a rapid increase of voltage fluctuations, noise power and o xidation rate were observed after the addition of 3% NaCl due to break down of the compactness of oxide film. The compact nature of oxide fil m and their breakdown has also been confirmed by recording power spect ral density plots in particular melt system.