Inconel 617 corrosion in FLiNaK molten salts: An in situ X-ray diffraction study. (15th April 2021)

• Record Type: Journal Article
• Authors: Lei, Qi; Zhang, Xingming; Gao, Mei; Wen, Wen; Jia, Yanyan; Liu, Huajian; Li, Yuhe; Liu, Jizhao; Zhou, Xingtai
• Is Part Of: Corrosion science. Volume 182(2021)
• Publication Date: 2021-04-15
• Subjects: In situ X-ray diffraction -- Fluoride molten salts -- Corrosion -- Order-disorder transition; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109289
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Novel in situ XRD apparatus is invented and is facilely used for high temperature molten salts studies. Disorder/order phase transition observed during temperature increase/decrease process of Inconel 617. Disordering is suppressed by FLiNaK molten salts addition, which makes alloy vulnerable to corrosion. Cr, Mo and Co are consequently separated out from alloy lattice during extended corrosion by FLiNaK molten salts. Abstract: An in situ XRD apparatus is developed to study facilely the corrosion of Inconel 617 in FLiNaK molten salts under three different experimental conditions. Inconel 617 undergoes disorder/order phase transition during temperature increase/decrease process and FLiNaK molten salts addition interrupts this transition, and makes the alloy vulnerable to be corroded. FLiNaK dehydration, FLiNaK melting, Inconel 617 corrosion and FLiNaK solidification processes are clearly observed during in-situ corrosion studies. During extended fluoride molten salts corrosion, Cr, Mo, and Co are separated out from alloy lattice consequently.