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01-11-2014 | Issue 11/2014

Journal of Materials Engineering and Performance 11/2014

Corrosion Behavior of Bare, Cr3C2-25%(NiCr), and Cr3C2-25%(NiCr)+0.4%CeO2-Coated Superni 600 Under Molten Salt at 900 °C

Journal:
Journal of Materials Engineering and Performance > Issue 11/2014
Authors:
Deepa Mudgal, Sanjeet Kumar, Surendra Singh, Satya Prakash

Abstract

Cr3C2-25(NiCr) and Cr3C2-25(NiCr)+0.4%CeO2 coatings were deposited on nickel-based superalloy Superni 600 by Detonation-gun technique. Studies were conducted on bare and coated alloys in molten salt environment (Na2SO4-25%NaCl) at 900 °C under cyclic condition. Characterization of the corrosion product was done using field emission scanning electron microscopy/energy dispersive spectroscopy and x-ray diffraction techniques. The bare Superni 600 shows penetration of corrosion beneath the metal layer thereby indicating internal oxidation. The coating of Cr3C2-25(NiCr) with 0.4%CeO2 leads to the formation of adherent scale.

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