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CORROSION PERFORMANCE OF PLASMA SPRAYED ALUMINA–40 wt.% TITANIA COATED HIGH-DENSITY GRAPHITE IN MOLTEN LiCl–KCl EUTECTIC SALT

Author

Listed:
  • JAGADEESH SURE

    (Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India)

  • D. SRI MAHA VISHNU

    (��Department of Biological Sciences and Chemistry & Natural and Medical Sciences Research Center, University of Nizwa, Nizwa 616, Oman)

  • U. KAMACHI MUDALI

    (��Vellore Institute of Technology, Bhopal 466114, Madhya Pradesh, India)

Abstract

The corrosion performance of plasma sprayed alumina–40wt.% titania (A40T) coated high-density graphite was investigated in molten LiCl–KCl eutectic salt at 600∘C for periods of 500, 1000, and 2000h under argon atmosphere. The microstructural and compositional investigations of corrosion-tested A40T coatings by scanning electron microscopy and energy dispersive X-ray spectroscopy showed that the samples exhibited better corrosion resistance up to 500h. The poor corrosion behavior and failure of A40T coating from graphite substrate in the long-term (1000 and 2000h) immersion was discussed in detail based on the microstructure and composition analysis. The phases existing in the as-sprayed coating (β-Al2TiO5, γ-Al2O3, R-TiO2, and α-Al2O3) remained in the detached coating after 1000h exposure to the molten salt. The reaction between molten salt and A40T coating was not evident from XRD analysis. A40T coatings with chromium carbide–nichrome (Cr3C2–NiCr) bond coat showed complete spallation of the top coating and oxidation of the bond coat as evident from the X-ray diffraction analysis. Detachment of the A40T coating occurred due to the penetration of the molten salt into the coating through the voids and pores present on the surface, which weakened the adhesion strength between the substrate and the A40T coating or top coat-bond coat interfaces.

Suggested Citation

  • Jagadeesh Sure & D. Sri Maha Vishnu & U. Kamachi Mudali, 2025. "CORROSION PERFORMANCE OF PLASMA SPRAYED ALUMINA–40 wt.% TITANIA COATED HIGH-DENSITY GRAPHITE IN MOLTEN LiCl–KCl EUTECTIC SALT," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 32(05), pages 1-13, May.
    • Handle: RePEc:wsi:srlxxx:v:32:y:2025:i:05:n:s0218625x22400030
    DOI: 10.1142/S0218625X22400030
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