Electrochemical Study on the Kinetic Properties of Fe 2+ /Fe, Ni 2+ /Ni, Cr 2+ /Cr and Cr 3+ /Cr 2+ in Molten MgCl 2 -KCl-NaCl Salts

Yang, Qiufeng; Ge, Jianbang; Zhang, Jinsuo

doi:10.1149/1945-7111/abdafc

Electrochemical Study on the Kinetic Properties of Fe ²⁺ /Fe, Ni ²⁺ /Ni, Cr ²⁺ /Cr and Cr ³⁺ /Cr ²⁺ in Molten MgCl ₂ -KCl-NaCl Salts

Journal Article · Thu Dec 31 23:00:00 EST 2020 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/abdafc· OSTI ID:1848766

^[1]; ; Zhang, Jinsuo

OSTI

The fundamental kinetic parameters of corrosion product ions (Fe, Ni and Cr ions) are of significant importance to understand the corrosion mechanisms of the structural materials in the molten salts. In the present study, the fundamental data of Fe²⁺, Ni²⁺, Cr²⁺and Cr³⁺ (diffusion coefficient D, exchange current density i₀, charge transfer coefficient α, limiting current density i_L and standard rate constant k⁰) were measured at different concentrations (1.53 × 10^-6-7.48 × 10^-4mol cm^-3) and temperatures (600 °C–800 °C). The values of D are independent of concentrations and follow Arrhenius law with temperature, which descend in the order of $D_{C r^{2 +}}$ > $D_{F e^{2 +}}$ > $D_{C r^{3 +}}$ > $D_{N i^{2 +}},$ with values ranging from 0.94 × 10^-5 to 3.31 × 10^-5cm²s^-1. Both i₀ and k⁰ depend on the temperatures, which also follow Arrhenius law. The values of the estimated k⁰ descend in the order of $k_{C r^{2 +}}^{0}$ > $k_{F e^{2 +}}^{0}$ > $k_{N i^{2 +}}^{0}$ > $k_{C r^{3 +}}^{0},$ which range from 1.88 × 10^-5 to 9.06 × 10^-4 cm s^-1.

Research Organization:: Rensselaer Polytechnic Inst., Troy, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0008380

OSTI ID:: 1848766

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 168; ISSN 0013-4651

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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Electrochemical Study on the Kinetic Properties of Fe 2+ /Fe, Ni 2+ /Ni, Cr 2+ /Cr and Cr 3+ /Cr 2+ in Molten MgCl 2 -KCl-NaCl Salts

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Electrochemical Study on the Kinetic Properties of Fe ²⁺ /Fe, Ni ²⁺ /Ni, Cr ²⁺ /Cr and Cr ³⁺ /Cr ²⁺ in Molten MgCl ₂ -KCl-NaCl Salts