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The oxidation behaviour of T-91 steel and T-22 steel in salt of 75wt.% Na2SO4+25wt.% NaCl has been studied under isothermal conditions at a temperature of 900°C in a cyclic manner. Oxidation kinetics was established for the T-91 steel and T-22 steel in salt at 900°C under cyclic conditions for 50 cycles by thermogravimetric technique. Each cycle consisted of 1 hour heating at 900°C followed by 20 min of cooling in air. Both the samples nearly followed the parabolic rate law of oxidation. X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray (SEM/EDAX) techniques were used to characterise the oxide scales. T-91 steel was found to be more corrosion resistant than T-22 steel under salt oxidation.

journal of minerals and materials characterization and engineering

High Temperature Corrosion Behaviour of T-91 and T-22 Bare Steel in 75wt.%Na&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;SO&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;+25wt.%NaCl Molten Salt Environment at 900&amp;#176;C