Abstract
Fuels used in boilers/gas-turbines, pulp & paper industry, diesel-engines and other machinery, contains vanadium or sulphates and form compounds of low melting phase during combustion which are more corrosive for high temperature materials. This research-article examines the corrosion kinetics and oxide of weldments in steels (SA213- T11) in molten-salt (Na2SO4-60% V2O5) environment under thermal cyclic conditions-at 900 °C. The thermogravimetry technique was used to elucidate the kinetics of corrosion. The results reveal the TIG weldment indicated lower weight gain during some initial cycles than those of SMAW weldment but subsequently increased due to the voids-formation in inner scale of HAZ, and non-availability of Cr in oxide of TIG weldment as reported in the given environment leads to high corrosion rate.
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