Nickel-plating for active metal dissolution resistance in molten fluoride salts

Olson, Luke C.; Sridharan, Kumar; Anderson, Mark; Allen, Todd R.

doi:10.1016/j.jnucmat.2011.01.032

Cited by 75 publications

(29 citation statements)

References 22 publications

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“…While nickel-based alloys, in particular those derived from the Ni-Cr-W system, have demonstrated considerable microstructural phase stability and retention of mechanical properties after longterm exposure at temperature [2], there is concern regarding the microstructural stability of these alloys in molten fluoride salts [3,4]. However, chromium carbides have been shown to form on graphite components used to investigate the corrosion resistance of nickel-based alloys [3], which suggests that this particular subset of refractory materials could be used as a corrosion barrier for alloys in molten fluoride salt environments.…”

Section: Introductionmentioning

confidence: 99%

“…Research has shown in [3,4] that the predominant mechanism of molten fluoride salt corrosion in nickel-based alloys with high Cr content is selective dealloying of Cr from the grain boundaries of the matrix phase (a solid solution of Ni, Cr and other common alloying elements) [8]. Exposure of sprayed Cr 3 C 2 -NiCr cermet coatings to a molten fluoride salt environment would likely result in the selective dealloying of Cr from the NiCr binder phase, followed by the formation of voids via vacancy diffusion and coalescence.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of binder-free Cr3C2 coatings on nickel-based alloys for molten fluoride salt corrosion resistance

Brupbacher

Zhang

Buchta

et al. 2015

Journal of Nuclear Materials

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a b s t r a c tUnder various conditions, chromium carbides appear to be relatively stable in the presence of molten fluoride salts and this suggests that their use in corrosion resistant coatings for fluoride salt environments could be beneficial. One method for producing these coatings is the carburization of sprayed Cr coatings using methane-containing gaseous precursors. This process has been investigated for the synthesis of binder-free chromium carbide coatings on nickel-based alloy substrates for molten fluoride salt corrosion resistance. The effects of the carburization process on coating microstructure have been characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) in conjunction with energy dispersive spectroscopy (EDS). Both plasma-sprayed and cold-sprayed Cr coatings have been successfully converted to Cr 3 C 2 , with the mechanism of conversion being strongly influenced by the initial porosity in the as-deposited coatings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of binder-free Cr3C2 coatings on nickel-based alloys for molten fluoride salt corrosion resistance

Brupbacher

Zhang

Buchta

et al. 2015

Journal of Nuclear Materials

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“…The cooling of Thorium Molten Salt Reactor (TMSR) with the molten salts, however, brings new problems connected with high temperature corrosion. In molten fluoride salts the surface scale of alloys are chemically unstable, and corrosion is driven largely by the thermodynamically driven dissolution of alloying elements into the molten salt environment [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

High-temperature corrosion behavior of Ni–16Mo–7Cr–4Fe superalloy containing yttrium in molten LiF–NaF–KF salt

Zhou

et al. 2015

Journal of Nuclear Materials

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“…The corrosion resistance to molten fluorides at high temperatures is a key element for the choice of structural materials. Over the past 60 years, great efforts have been devoted to the issues of materials and corrosion with molten fluoride salts [5][6][7][8][9][10]. In many high temperature environments, the corrosion resistance of metals or alloys depends on their surface scales among which chromium, aluminium, or silicon oxide scale can provide an excellent protection to alloys.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Studies of the Corrosion of Pure Fe, Ni and Cr in Molten (Li,Na,K)F

Wang

Zeng

2014

High Temperature Materials and Processes

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The corrosion of structural materials is a great challenge for the applications of a molten salt reactor using molten fluorides. In this paper, electrochemical behavior of pure Fe, Ni and Cr has been investigated in molten (Li,Na,K)F at 973 K by potentiodynamic polarization and electrochemical impedance spectroscopy. The experimental results indicated that three metals are all in active state at the corrosion potential, with an increase in the corrosion potential by the following order: Cr, Fe, Ni. The free corrosion current density of Ni is more than one order of magnitude lower than that of Fe and Cr. A Warburg impedance was observed in the impedance plots for the corrosion of Cr, but not for Ni and Fe. Ni is the most stable metal, then Fe and Cr, and the corrosion of Cr is controlled by the diffusion of oxidants in the melt.

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Nickel-plating for active metal dissolution resistance in molten fluoride salts

Cited by 75 publications

References 22 publications

Synthesis and characterization of binder-free Cr3C2 coatings on nickel-based alloys for molten fluoride salt corrosion resistance

Synthesis and characterization of binder-free Cr3C2 coatings on nickel-based alloys for molten fluoride salt corrosion resistance

High-temperature corrosion behavior of Ni–16Mo–7Cr–4Fe superalloy containing yttrium in molten LiF–NaF–KF salt

Electrochemical Studies of the Corrosion of Pure Fe, Ni and Cr in Molten (Li,Na,K)F

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