A simultaneous corrosion/irradiation facility for testing molten salt-facing materials

Zhou, Weiyue; Woller, K.; Zheng, Guiqiu; Stahle, P. W.; Short, Michael P.

doi:10.1016/j.nimb.2018.11.024

Cited by 16 publications

(6 citation statements)

References 21 publications

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“…Simultaneous irradiation and corrosion experiments. Details of the facility used in this study can be found in this reference 17 . Salt and sample loading were both performed in the same glove box mentioned previously.…”

Section: Methodsmentioning

confidence: 99%

“…Thin foil samples of Ni-20Cr exposed to 650°C fluoride salt were irradiated with a beam of protons in a previously constructed, simultaneous irradiation/corrosion facility 17 . The central region of each sample was exposed to both protons and molten salt, while the outer region of each sample was exposed only to molten salt.…”

Section: Evidence Of Radiation-decelerated Corrosion Of Ni-cr Alloysmentioning

confidence: 99%

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Proton irradiation-decelerated intergranular corrosion of Ni-Cr alloys in molten salt

et al. 2020

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The effects of ionizing radiation on materials often reduce to "bad news". Radiation damage usually leads to detrimental effects such as embrittlement, accelerated creep, phase instability, and radiation-altered corrosion. Here we report that proton irradiation decelerates intergranular corrosion of Ni-Cr alloys in molten fluoride salt at 650°C. We demonstrate this by showing that the depth of intergranular voids resulting from Cr leaching into the salt is reduced by proton irradiation alone. Interstitial defects generated from irradiation enhance diffusion, more rapidly replenishing corrosion-injected vacancies with alloy constituents, thus playing the crucial role in decelerating corrosion. Our results show that irradiation can have a positive impact on materials performance, challenging our view that radiation damage usually results in negative effects.

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Section: Methodsmentioning

confidence: 99%

Section: Evidence Of Radiation-decelerated Corrosion Of Ni-cr Alloysmentioning

confidence: 99%

Proton irradiation-decelerated intergranular corrosion of Ni-Cr alloys in molten salt

et al. 2020

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“…Details of the facility used in this study can be found in this reference 18 . Salt and sample loading were both performed in the same glove box mentioned previously.…”

Section: B Simultaneous Irradiation and Corrosion Experimentsmentioning

confidence: 99%

“…We have constructed a simultaneous irradiation/corrosion facility to explore how proton irradiation affects corrosion 18 , by passing a beam of protons through central part of a thin foil sample in contact with 650 • C fluoride salt. Our experiments show that in all cases the unirradiated region suffers severe corrosion through the thickness of the foil, as evident by the penetration of salt to the other side.…”

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confidence: 99%

Proton Irradiation-Decelerated Intergranular Corrosion of Ni-Cr Alloys in Molten Salt

Zhou,

Yang,

Zheng

et al. 2019

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The effects of ionizing radiation on materials often reduce to "bad news." Radiation damage usually leads to detrimental effects such as embrittlement 1 , accelerated creep 2 , phase instability 3 , and radiationaltered corrosion 4 . This last point merits special attention. Elucidating synergies between radiation and corrosion has been one of the most challenging tasks impeding the deployment of advanced reactors 5 , stemming from the combined effects of high temperature, corrosive coolants, and intense particle fluxes 6 . Here we report that proton irradiation significantly and repeatably decelerates intergranular corrosion of Ni-Cr alloys in molten fluoride salt at 650 • C. We demonstrate this effect by showing that the depth of intergranular voids resulting from Cr leaching into the salt is reduced by the proton irradiation alone. Interstitial defects generated from proton irradiation result in radiation-enhanced diffusion, more rapidly replenishing corrosion-injected vacancies with alloy constituents, thus playing the crucial role in decelerating corrosion. Our results show that in industrially-relevant scenarios irradiation can have a positive impact, challenging our view that radiation damage always results in negative effects.It has been well established that radiation accelerates corrosion of structural materials in today's reactors 7 , as in-core experiments 8 and accelerator studies 9 have shown. However, multiple competing mechanisms may be present 10 . An overall increase in corrosion rate does not necessarily mean that each mechanism at play accelerates corrosion. The mechanisms and their relative strengths will necessarily change in different working fluids. In fact, observations of structural materials from the Molten Salt Reactor Experiment showed low corrosion rates 11 . This suggests that the influence of irradiation on corrosion in molten salts might be different from that in water-based systems. However, the reason(s) for this potential synergy have remained hidden for more than half a century.

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“…A dedicated facility [2] that enables concurrent proton irradiation and molten salt corrosion has been constructed at MIT. With this facility, we prepared two batch of samples: (1) corrosion only; (2) concurrent corrosion and proton irradiation.…”

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Advanced Electron Microscopy Characterization of Intergranular Corrosion in Ni-20Cr Alloy Under Molten Salt Environment

et al. 2020

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A simultaneous corrosion/irradiation facility for testing molten salt-facing materials

Cited by 16 publications

References 21 publications

Proton irradiation-decelerated intergranular corrosion of Ni-Cr alloys in molten salt

Proton irradiation-decelerated intergranular corrosion of Ni-Cr alloys in molten salt

Proton Irradiation-Decelerated Intergranular Corrosion of Ni-Cr Alloys in Molten Salt

Advanced Electron Microscopy Characterization of Intergranular Corrosion in Ni-20Cr Alloy Under Molten Salt Environment

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