Authors: Ludwig, D; Olson, L; Sridharan, K; Anderson, M; Allen, T

Source: Corrosion Engineering, Science and Technology, Volume 46, Number 4, June 2011 , pp. 360-364(5)

Publisher: Maney Publishing

Abstract:

An in situ electrochemical probe, utilising anodic stripping voltammetry (ASV), has been developed to measure dissolved Cr concentration in the molten salt LiF?KF?NaF (46?5?11?5?42 mol.-%), commonly referred to as FLiNaK. Tests were performed in a glassy carbon crucible in an argon atmosphere glovebox at a molten salt temperature of 650?C. Cyclic voltammetry was performed to determine reversibility and mid peak potential. The Cr²⁺/Cr⁰ reaction occurred with a mid peak potential of ?0?51 V versus a 10 mol.-% Ni²⁺/Ni⁰ reference electrode. The integrated current from the anodic waves at this potential were used for Cr cation quantification. The integrated current from the ASV measurements correlated linearly with Cr concentration, measured independently using neutron activation analysis, over a range of 30?950 ppm (1?2?38 mmol L^?1). This study is significant for determining Cr concentrations in high temperature molten FLiNaK salts exposed to Cr containing structural materials.

Keywords: Corrosion; FLiNaK; High temperature; Chromium; Electrochemistry; Molten salt

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/147842209X12579401586645

Affiliations: Department of Engineering Physics, University of Wisconsin, Madison, WI 53706, USA

Publication date: 2011-06-01

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