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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

ABSTRACT

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.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

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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