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

Jagadeesh Sure, D. Sri Maha Vishnu and U. Kamachi Mudali
Additional contact information
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

Surface Review and Letters (SRL), 2025, vol. 32, issue 05, 1-13

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.

Keywords: Graphite; Al2O3–40wt.% TiO2; plasma spray coatings; molten salt corrosion; microstructure; X-ray diffraction; degradation (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X22400030
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:32:y:2025:i:05:n:s0218625x22400030

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X22400030

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().