Erosion-corrosion behaviour of Ni-based superalloy Superni-75 in the real service environment of the boiler

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Abstract

The super-heater and re-heater tubes of the boilers used in thermal power plants are subjected to unacceptable levels of surface degradation by the combined effect of erosion-corrosion mechanism, resulting in the tube wall thinning and premature failure. The nickel-based superalloys can be used as boiler tube materials to increase the service life of the boilers, especially for the new generation ultra-supercritical boilers.The aim of the present investigation is to evaluate the erosion-corrosion behaviour of Ni-based superalloy Superni-75 in the real service environment of the coal-fired boiler of a thermal power plant. The cyclic experimental study was performed for 1000 h in the platen superheater zone of the coal-fired boiler where the temperature was around 900°C. The corrosion products have been characterized with respect to surface morphology, phase composition and element concentration using the combined techniques of X-ray diffractometry (XRD), scanning electron microscopy/energy-dispersive analysis (SEM/EDAX) and electron probe micro analyser (EPMA). The Superni-75 performed well in the coal-fired boiler environment, which has been attributed mainly to the formation of a thick band of chromium in scale due to selective oxidation of the chromium. © 2009 Indian Academy of Sciences.

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Sidhu, T. S., Prakash, S., Agrawal, R. D., & Bhagat, R. (2009). Erosion-corrosion behaviour of Ni-based superalloy Superni-75 in the real service environment of the boiler. Sadhana - Academy Proceedings in Engineering Sciences, 34(2), 299–307. https://doi.org/10.1007/s12046-009-0009-x

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