OXIDATION AND HOT CORROSION BEHAVIOR OF NIMONIC-75 SUPERALLOY

Experiments were carried out to study the oxidation and hot corrosion behaviour of Nimonic-75 superalloy in the unwelded and welded conditio ns in the temperature range of 700-1000 degrees C. The salt mixture us ed for hot corrosion studies was 90% Na2SO4 and 10% NaCl. While the ox idation attack increased with temperature, the hot corrosion attack dr opped in the higher ranges of temperature. This is attributed to vapou risation of the salt mixture. The weight gain due to oxidation and hot corrosion followed a power function the exposure time.