High Temperature Degradation of Co Based Superalloy in Incinerator Environment


Article Preview

Degradation by high temperature oxidation and hot corrosion is the main failure mode of components in the hot section of gas turbines, boilers, industrial waste incinerators, metallurgical furnaces and petrochemical installations etc. Corrosive environment is because of the usage of wide range of fuel containing large amount of Cl and S together with the volatile alkali metals such as K and Na which leads to the degradation of material. To obviate this problem, superalloy Superco 605 has been studied in air as well as in molten salt environment at 900°C for 100cycles. Weight change measurements were taken by a digital electronic weighing balance having accuracy of 1 mg after each cycle (heating at 900°C for 1 hr. and subsequently cooling in air for 20 min.) which was used to determine the kinetics of corrosion. The oxide scales formed on the surface of the superalloy were characterized by various techniques such as FESEM, EDAX and XRD. It was found that superco 605 shows good oxidation resistance in air at 900°C but poor corrosion resistance in simulated incinerator environment.



Edited by:

B.S.S. Daniel and G.P. Chaudhari




D. Mudgal et al., "High Temperature Degradation of Co Based Superalloy in Incinerator Environment", Advanced Materials Research, Vol. 585, pp. 542-546, 2012

Online since:

November 2012




[1] M.A. Uusitalo, P.M.J. Vuorite, T.A. Mantyla, High temperature corrosion of coatings nd boiler steels in reducing chlorine-containing atmosphere, Surface and coatings Technology, 161, 2002, pp.275-285.

DOI: https://doi.org/10.1016/s0257-8972(02)00472-3

[2] Sofia Karlsson, Lars-Erik Amand and Jasper Pettersson , Reducing high temperature corrosion when burning waste by adding digested sewage sludge, Proceeding of the Swedish –flame days, International Flame research foundation, pp.26-27.

[3] Christensen, K.A. (1995), The formation of submicron particles from the combustion of straw, PhD dissertation, Department of chemical Engg, technical university of Denmark.

[4] H.J. Grabke, E. Reese and M. Spiegel, Corros. Sci. 37 (1995), p.1023.

[5] H.H. Krause, High temperature corrosion problems inwaste incineration systems, Journal of materials for energy systems, Vol7, Number4, March 1986, pp.322-332.

DOI: https://doi.org/10.1007/bf02833571

[6] K. Weulersse-Mouturat, G. Moulin, P. Billard and G Pierotti , High temperature corrosion of superheater tubes in waste incinerators and coal fired plants, Material Science Forum, Vols 461-464 (2004) pp.973-980.

DOI: https://doi.org/10.4028/www.scientific.net/msf.461-464.973

[7] R. Prescott, F.H. Stott and P. Elliott, Investigations of the Degradation of High-Temperature Alloys in a Potentially Oxidizing-Chloridizing Gas Mixture, Oxidation of Metals, Vol. 31, Nos. 1/2, 1989, pp.145-166.

DOI: https://doi.org/10.1007/bf00665491

[8] Subhash Kamal, R Jayaganthan and S Prakash, High temperature cyclic oxidation and hot corrosion behaviours of superalloys at 900°C, Bull. Mater. Sci., Vol. 33, No. 3, June 2010, p.299–306. © Indian Academy of Science.

DOI: https://doi.org/10.1007/s12034-010-0046-4

[9] Daniela Pilone, feeriic stainless steels for high temperature applications in oxidizing environment, Recent patenets on Materials Science, Vol 2, 2009, pp.27-31.

DOI: https://doi.org/10.2174/1874464810902010027

[10] T.S. Sidhu, S. Prakash, R.D. Agrawal, Hot corrosion studies of HVOF sprayed Cr3C2–NiCr and Ni–20Cr coatings on nickel-based superalloy at 900 °C, Surface and Coatings Technology Volume 201, Issues 3-4, 5 October 2006, pp.792-800.

DOI: https://doi.org/10.1016/j.surfcoat.2005.12.030

[11] Pettit, F.S., Meier G.H., Oxidation and hot corrosion of superalloys" , in Gell,M. et al. (eds. ), 'Superalloys 1984, (1984), pp.651-683.

DOI: https://doi.org/10.7449/1984/superalloys_1984_651_687

[12] Harpreet Singh , Gitanjaly, Surendra Singh, S. Prakash High temperature corrosion behaviour of some Fe-, Co- and Ni-base superalloys in the presence of Y2O3 as inhibitor Applied Surface Science Volume 255, Issue 15, 15 May 2009, pp.7062-7069.

DOI: https://doi.org/10.1016/j.apsusc.2009.03.040