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Effect of CeO2 on Cyclic Hot-Corrosion Behavior of Detonation-Gun Sprayed Cr3C2-NiCr Coatings on Ni-Based Superalloy

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Abstract

The hot-corrosion behavior of detonation-gun sprayed Cr3C2-NiCr coatings with and without 0.4 wt.% CeO2 additive on Ni-based superalloy inconel-718 is comparatively discussed in the present study. Hot-corrosion studies were carried out at 900 °C for 100 cycles in Na2SO4-60%V2O5 molten salt environment under cyclic heating and cooling conditions on bare and coated superalloys. The thermo-gravimetric technique was used to establish kinetics of hot-corrosion. XRD, FESEM/EDAX, and EDX mapping techniques were used to analyze the corrosion products of bare and coated samples. The results indicate that Cr3C2-NiCr-CeO2-coated superalloy showed better hot-corrosion resistance as compared to bare and Cr3C2-NiCr-coated superalloys. The addition of CeO2 has improved micro-hardness, porosity, and surface roughness values of Cr3C2-NiCr-CeO2 coating. The overall weight gain and parabolic rate constant of Cr3C2-NiCr-CeO2-coated superalloy were found to be lowest in the present study signifying that the addition of CeO2 in Cr3C2-NiCr powder has contributed to the development of adherent and dense oxide scale on the coating at elevated temperature.

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Acknowledgment

The authors would like to thank Dr. Mukul Gupta of UGC-DAE Consortium for Scientific Research, Indore for performing XRD analysis. The authors also wish to thank Mr. Hiren Upadhyay and Mr. Sagar Jagtap of SIC, SVNIT, Surat for performing SEM/EDAX analysis.

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Authors and Affiliations

  1. SVNIT - Mechanical Engineering, Dumas Rd, Ichchhanath, Surat, Gujarat, 395007, India

    Sekar Saladi & Jyoti Menghani

  2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Roorkee, Uttarakhand, India

    Satya Prakash

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  1. Sekar Saladi
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Saladi, S., Menghani, J. & Prakash, S. Effect of CeO2 on Cyclic Hot-Corrosion Behavior of Detonation-Gun Sprayed Cr3C2-NiCr Coatings on Ni-Based Superalloy. J. of Materi Eng and Perform 24, 1379–1389 (2015). https://doi.org/10.1007/s11665-015-1400-x

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