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Hot Corrosion Studies of Detonation-Gun-Sprayed NiCrAlY + 0.4 wt.% CeO2 Coated Superalloys in Molten Salt Environment

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Abstract

Rare earth oxide (CeO2) has been incorporated in NiCrAlY alloy and hot corrosion resistance of detonation-gun-sprayed NiCrAlY + 0.4 wt.% CeO2 coatings on superalloys, namely, superni 75, superni 718, and superfer 800H in molten 40% Na2SO4-60% V2O5 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. CeO2 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.

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Acknowledgments

The authors are very thankful to SVX Powder M Surface Engineering Pvt Ltd, New Delhi (India) for having provided a D-gun coating facility.

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  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Subhash Kamal, R. Jayaganthan & Satya Prakash

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  1. Subhash Kamal
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Correspondence to R. Jayaganthan.

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Kamal, S., Jayaganthan, R. & Prakash, S. Hot Corrosion Studies of Detonation-Gun-Sprayed NiCrAlY + 0.4 wt.% CeO2 Coated Superalloys in Molten Salt Environment. J. of Materi Eng and Perform 20, 1068–1077 (2011). https://doi.org/10.1007/s11665-010-9728-8

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  • DOI: https://doi.org/10.1007/s11665-010-9728-8

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