Corrosion of Incoloy 800H alloys with nickel cladding in FLiNaK salts at 850 °C

Dai, Qilong; Ye, Xiang‐Xi; Ai, Hua; Chen, Shuangjian; Li, Jiang; Liang, Jian-Ping; Yu, Kun; Leng, Bin; Li, Zhijun; Zhou, Xingtai

doi:10.1016/j.corsci.2018.01.026

Cited by 53 publications

(20 citation statements)

References 18 publications

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“…The present paper focused on the study of the corrosion behavior [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] of the FeCr-NiTi, NiCrMo, and NiCu alloys during long-term corrosion tests in the high-temperature aggressive alkali fluorides containing cerium trifluoride and neodymium trifluoride as imitators of the nuclear fuel fission products (uranium and plutonium fluorides).…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Candidate Functional Materials for Molten Salts Reactors in LiF–NaF–KF Containing Actinide Fluoride Imitators

et al. 2022

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Molten fluorides of alkali metals are considered a technological medium for molten salt reactors (MSRs). However, these media are known to be extremely corrosive. The successful implementation of high-temperature technological devices using molten alkali metal fluorides requires the selection of such structural materials that have high corrosion resistance in melts with compositional characteristic of MSRs. In this research, the corrosion behavior of 12Cr18Ni10Ti steel, the alloy Ni60Cr20Mo15, and the alloy Monel 404 (Ni50Cu50) was investigated in the LiF–NaF–KF eutectic melt, containing additions of CeF3 and NdF3 from 0 to 5 wt.% as imitator fluorides of actinides in an inert argon atmosphere at 550 °C for 100 h. Gravimetry, energy-dispersive X-ray (EDX) microanalysis of surfaces and cross-section of samples, and ICP-MS were used to establish the corrosion behavior of the investigated alloys. Corrosion resistance of the studied materials was found to decrease in a row from Monel 404 > Hastelloy C2000 > 12Cr18Ni10Ti. The addition of cerium fluoride into the melt resulted in the additional etching of the alloy surface. The addition of neodymium fluoride resulted in the formation of the point/inter-crystalline corrosion damages in the sample bulk. The samples of steel 12Cr18Ni10Ti were subjected to local cracking corrosion. The austenitic nickel-based alloys suffered specific local corrosion with formation of subsurface voids. Excellent corrosion resistance of the Monel alloy under the test conditions was found.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Candidate Functional Materials for Molten Salts Reactors in LiF–NaF–KF Containing Actinide Fluoride Imitators

et al. 2022

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“…Of these materials, stainless steel coatings are the most economical in common service environments. The presence of the elements chromium, nickel, and molybdenum in stainless steel makes it resistant to corrosion …”

Section: Introductionmentioning

confidence: 99%

Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

Liu

Huang

Bao

et al. 2020

steel research int.

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Herein, single-pass laser-cladded 2205 duplex stainless steel is fabricated on the surface of Q235 carbon steel at different laser powers in the range of 1.7À2.7 kW. The relationships between laser powers and geometrical characteristics, microstructure, microhardness, and corrosion resistance of the cladded layers (CLs) are analyzed. The results show that with the increase in laser power, the width and height of the bead increase, and the dilution rate and depth of the molten pool also significantly increase. Furthermore, the shape of ferrite gradually transforms from coarse to slender and eventually turns into a discontinuous vermicular shape. It is found that the CL obtained at a laser power of 2.3 kW has higher average microhardness and exhibits better corrosion resistance than the other samples (%20 times better than that of the carbon steel substrate), with its corrosion potential and corrosion current density of À0.146 V and 0.13 μA cm À2 , respectively.

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“…In our Ni-Cr binary alloy, Cr is preferentially depleted by molten salt because the redox potential of Cr is considerably lower than that of Ni in our LiF-NaF-KF+EuF 3 (FLiNaK+EuF 3 ) fluoride salt 19 . Cr in the bulk would diffuse out of the system via fast routes such as GBs to reach the salt 20 . The outward mass flux from GB to salt is compensated by the diffusion of lattice atoms (Ni and Cr) from the bulk to GBs, creating a self-healing mechanism to inhibit void formation along GBs.…”

Section: Discussionmentioning

confidence: 99%

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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Corrosion of Incoloy 800H alloys with nickel cladding in FLiNaK salts at 850 °C

Cited by 53 publications

References 18 publications

Corrosion Behavior of Candidate Functional Materials for Molten Salts Reactors in LiF–NaF–KF Containing Actinide Fluoride Imitators

Corrosion Behavior of Candidate Functional Materials for Molten Salts Reactors in LiF–NaF–KF Containing Actinide Fluoride Imitators

Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

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

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Corrosion of Incoloy 800H alloys with nickel cladding in FLiNaK salts at 850 °C

Cited by 53 publications

References 18 publications

Corrosion Behavior of Candidate Functional Materials for Molten Salts Reactors in LiF–NaF–KF Containing Actinide Fluoride Imitators

Corrosion Behavior of Candidate Functional Materials for Molten Salts Reactors in LiF–NaF–KF Containing Actinide Fluoride Imitators

Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

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

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Corrosion of Incoloy 800H alloys with nickel cladding in FLiNaK salts at 850 °C