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Hot corrosion studies of detonation-gun-sprayed NiCrAlY + 0.4 wt.% CeO 2 coated superalloys in molten salt environment
, Kamal S., Satya Prakash
Published in Springer
2011
Volume: 20
   
Issue: 6
Pages: 1068 - 1077
Abstract
Rare earth oxide (CeO 2) has been incorporated in NiCrAlY alloy and hot corrosion resistance of detonation-gun-sprayed NiCrAlY + 0.4 wt.% CeO 2 coatings on superalloys, namely, superni 75, superni 718, and superfer 800H in molten 40% Na 2SO 4-60% V 2O 5 salt environment were investigated at 900°C for 100 cycles. The coatings exhibited characteristic splat globular dendritic structure with diameter similar to the original powder particles. The weight change technique was used to establish corrosion kinetics. X-ray diffraction (XRD), field emission scanning electron microscopy/energy-dispersive analysis (FE-SEM/EDAX), and x-ray mapping techniques were used to analyze the corrosion products. Coated superfer 800H alloy showed the highest corrosion resistance among the examined superalloys. CeO 2 was found to be distributed in the coating along the splat boundaries, whereas Al streaks distributed non-uniformly. The main phases observed for the coated superalloys are oxides of Ni, Cr, Al, and spinels, which are suggested to be responsible for developing corrosion resistance. © ASM International.
About the journal
JournalData powered by TypesetJournal of Materials Engineering and Performance
PublisherData powered by TypesetSpringer
ISSN10599495
Open AccessNo