Abstract
The effects of some sodium salts, namely Na 2SO 4, NaCl, NaNO 3 and Na 2CO 3 coatings, on the high-temperature oxidation behaviour of Nimonic-80A (N-80A) alloy at 1173 K in a slow current of air are presented. The oxidation kinetics and effects of salt deposition on the N-80A alloy were investigated. The alloy is more severely attacked by NaCl than by Na 2SO 4, due to the formation of volatile chlorides. NaNO 3- and Na 2CO 3-induced alloy seem to be more aggressive than Na 2SO 4 and NaCl due to the evolution of nitrogeneous and CO/CO 2 gases respectively. The scale morphologies were determined on the basis of X-ray diffraction analysis and scanning electron microscopic techniques.
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