JMMCE  Vol.9 No.7 , July 2010
High Temperature Corrosion Behaviour of T-91 and T-22 Bare Steel in 75wt.%Na2SO4+25wt.%NaCl Molten Salt Environment at 900°C
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.

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.
References
[1]   Harpreet Singh, D. Puri, S. Prakash, Some studies on hot corrosion performance of plasma sprayed coatings on a Fe-based superalloy, Surface & Coatings Technology 192, 25 May 2004,pp.27– 38.

[2]   R.J. Link, N. Birks, F.S. Pettit, F. Dethorey, The response of alloys to erosion– corrosion at high temperatures, Oxid. Met. 49 (3–4) (1998) pp.213–236.

[3]   I. Saeki, T. Saito, R. Furuichi, M. Itoh, Growth process of protective oxides formed on type 304 and 430 stainless steels at 1273°K, Corros. Sci. 40 (8) (1998) p.1295.

[4]   S. Jianian, Z. Longjiang, L. Tiefan, High temperature oxidation of Fe–Cr alloys in wet oxygen, Oxid. Met. 48 (3, 4) (1997) p.347.

[5]   Z. Tokei, H. Viefhaus, H.J. Grabke, Initial stages of oxidation of a 9CrMoV steel: role of segregation and martensite laths, Appl. Surf. Sci. 165 (1) (2000) p.23.

[6]   A. P. Greeff, C.W. Louw, H.C. Swart, The oxidation of industrial FeCrMo steel, Corros. Sci. 42 (10) (2000) p.1725.

[7]   A. Arztegui, T. Gomez-Acebo, F. Castro, Steam oxidation of ferritic steels: kinetics and microstructure, Bol. Soc. Esp. Ceram. Vidr. 39 (3) (2000). p.305.

[8]   A.S. Khanna, P. Rodriguez, J.B. Gananamoorthy, Oxidation kinetics, breakaway oxidation, and inversion phenomenon in 9Cr–1Mo steels, Oxid. Met. 26 (3, 4) (1986) p.171.

[9]   Mathew MD, Choudhary BK, Albert SK. Selection of materials for PFBR nuclear steam supply system components. Report-PFBR/MDG/2002/001, IGCAR Kalpakkam.

[10]   Baldev Raj, B.K. Choudhary, R.K. Singh Raman, Pressure Vessels and Piping 81 (2004) 521– 534.

[11]   Kimura K, Kushima H, Abe F, Yagi K, Irie H. In: Strang A, Banks WM, Conroy RD, Goulette MJ, editors. Advances in turbine materials, design and manufacturing. London: The Institute of Materials; 1997. pp. 257–69.

[12]   X. Wu, D. Weng, Z. Chen, L. Xu, Surface Coating Technology, 140 (2001), p.231.

[13]   P. Niranatlumpong, C.B. Ponton, H.E. Evans, Oxid. Met, 53 (3–4) (2000), pp. 241- 258.

[14]   Buta Singh Sidhu, S. Prakash , Performance of NiCrAlY, Ni–Cr, Stellite-6 and Ni3Al coatings in Na2SO4–60% V2O5 environment at 900°C under cyclic conditions, Surface & Coatings Technology 201,17 April 2006, pp.1643–1654.

[15]   S. Danyluk, J.Y. Park, Corrosion 35 (12) (1979) p.575.

[16]   D. Wang, Surf. Coat. Technol. 36 (1988) p.49.

[17]   S.E. Sadique, A.H. Mollah, M.S. Islam, M.M. Ali, M.H.H. Megat, S.Basri, Oxid. Met. 54 (5–6), (2000) p.385.

[18]   H. Choi, B. Yoon, H. Kim, C. Lee, Surf. Coat. Technol. 150 (2–3) (2002) pp.297–308.

 
 
Top