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High Temperature Corrosion Behaviour of T-91 and T-22 Bare Steel in 75wt.%Na2SO4+25wt.%NaCl Molten Salt Environment at 900°C

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DOI: 10.4236/jmmce.2010.97042    3,095 Downloads   4,252 Views   Citations


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.

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D. Gond, V. Chawla, D. Puri and S. Prakash, "High Temperature Corrosion Behaviour of T-91 and T-22 Bare Steel in 75wt.%Na2SO4+25wt.%NaCl Molten Salt Environment at 900°C," Journal of Minerals and Materials Characterization and Engineering, Vol. 9 No. 7, 2010, pp. 593-606. doi: 10.4236/jmmce.2010.97042.


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