Hot corrosion is a serious problem in fired tube boiler materials. The deposition of oxalates from the water side does not allow the proper transfer of heat, resulting in overheating. This leads to catastrophic failures of boiler materials. In this study, GrA1 boiler tube steel was selected as a candidate material because it is used in several thermal power plants. Hot corrosion studies were conducted on different regions, i.e., base metal, weld metal, and heat-affected zone (HAZ) of tungsten inert gas (TIG) weldment in GrA1 steel in a molten salt (Na2SO4-60 % V2O5) environment at 900°C under cyclic conditions. The thermogravimetric technique was used to establish the kinetics of corrosion. The corrosion products formed on different regions of TIG welded steel were characterized by scanning electron microscopy with energy-dispersive X-ray analysis and X-ray diffraction pattern. Base metal was found to oxidize at much higher rates than those of weld metal and HAZ.
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