Cyclic oxidation behavior of Ni- and Fe-based superalloys in air and Na2SO4-25%NaCl molten salt environment at 800 oC
Year: 2006
Type: article
Abstract: The present investigation aims to evaluate the high-temperature oxidation and hot corrosion behaviour of Ni-basedsuperalloy (Superni 75) and Fe-based superalloy (Superfer 800H). The superalloy specimens were exposed to air andmolten salt (Na2SO4-25%NaCl) environment at 800 °C under cyclic conditions. The thermogravimetric technique wasused to establish the kinetics of corrosion. X-ray diffraction (XRD), scanning electron microscopy (SEM) and electronprobe micro analyser (EPMA) techniques were used to characterize the corrosion products. The hot corrosionresistance of Ni-based superalloys was found to be better than that of Fe-based superalloys. The formation of scalerich in Cr2O3, NiO and spinel NiCr2O4 has contributed for the better oxidation and hot corrosion resistance of Superni75, whereas relatively lesser hot corrosion resistance of Superfer 800H is due to the formation of non-protective oxideof iron, and sulphides of iron and nickel.
Source: African Journal of Physics
DOI: 10.5897/ijps.9000148
Authors: T.S. Sidhu, Ajay Malik, S. Prakash, R.D. Agrawal
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2232666325