High temperature molten salt corrosion of structural materials in UCl3–LiCl–KCl. (3rd July 2020)

• Record Type: Journal Article
• Authors: Jagadeeswara Rao, Ch.; Ningshen, S.
• Is Part Of: Corrosion engineering, science, and technology. Volume 55:Number 5(2020)
• Page Start: 425
• Page End: 433
• Publication Date: 2020-07-03
• Subjects: Molten salt -- high temperature corrosion -- thermogravimetry -- Raman spectroscopy; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1080/1478422X.2020.1741869
• Languages: English
• ISSNs: 1478-422X

Abstract

ABSTRACT: High temperature corrosion behaviour of 2.25Cr–1Mo, 9Cr–1Mo and SS 410 in molten UCl3 –LiCl–KCl salt at 500 and 600°C under inert and reactive atmospheres for 24 h were studied by thermogravimetry. The results indicate marginal weight gains in all the alloys. In all conditions, except at 600°C under reactive atmosphere, the weight gains were higher in initial period of exposure. The weight gain was continuous for samples studied at 600°C under reactive atmosphere. The 2.25Cr–1Mo showed higher weight gain in an inert atmosphere, whereas SS 410 showed more weight gain at 500°C and 9Cr–1Mo at 600°C under reactive atmosphere. The weight gains were attributed to the formation of γ-FeOOH, α-Fe2 O3, Fe3 O4, FeCr2 O4 and Cr2 O3 as confirmed by Raman spectra analysis. The oxide films formed are neither uniform as evidenced from SEM-EDS analysis nor protective, attributed to the corrosive and aggressive nature of molten chloride salts.