HOT CORROSION BEHAVIOR OF NICKEL-200 ALLOY IN PRESENCE OF SODIUM-SALTS AT 850-DEGREES-C

The hot corrosion behaviour of Nickel-200 industrial alloy has been in vestigated in presence of Na2SO4, NaCl, NaNO3, Na2CO3 and Na2O2 respec tively at 850 degrees C in flowing air. The hot corrosion kinetics and effect of salt deposition on the corrosion rate were studied. The sca le morphologies were determined on the basis of X-ray diffraction and scanning electron microscopic techniques. It has been shown that an al loy corrodes at different rate in presence of different sodium salts a lthough each salt contains the same amount equivalent to Na2O.