Effect of alloyed Ti on the microstructure and corrosion characteristics of a U–Ti alloy in a hydrogen environment

Shi, Pengjun; Li, Fangfang; Wu, Yanping; Ji, Hefei; Li, Ruiwen; Wang, Xiaolin

doi:10.1016/j.corsci.2015.01.005

Cited by 13 publications

(5 citation statements)

References 24 publications

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“…The typical polarization curves and corresponding parameters of the composite coatings and the uncoated DU sample in 0.01 mol/L NaCl are shown in Figure and Table , respectively. For the uncoated DU sample, the E corr and i corr values were determined to be −508.1 ± 35.1 mV (vs SCE) and 8.063 ± 0.07 μA/cm 2 , respectively, which were in accordance with results in the literature . For the Al 2 O 3 coating, the E corr of the sample with Al 2 O 3 coating (sample a) increased about 417 mV (vs SCE) in the positive direction compared with the uncoated DU sample, demonstrating a decrease in the tendency of corrosion initiation.…”

Section: Resultssupporting

confidence: 88%

Corrosion resistance of Al₂O₃‐Y₂O₃‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

et al. 2018

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Al2O3‐Y2O3‐SiC composite coatings were prepared on depleted uranium by cathode plasma electrolytic deposition in Al(NO3)3, Y(NO3)3, SiC nanoparticles and anhydrous ethyl alcohol mixture. The resulting coating consisted of an inner barrier layer and an outer porous layer. The SiC nanoparticles were incorporated into the composite coating and decreased the coating porosity by filling the pores. The potentiodynamic polarization test and neutral salt spray test revealed that the corrosion resistance of depleted uranium was enhanced by the composite coating. Moreover, with increasing the content of SiC nanoparticles in the coating, the coating corrosion resistance was improved gradually.

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Section: Resultssupporting

confidence: 88%

Corrosion resistance of Al₂O₃‐Y₂O₃‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

et al. 2018

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“…Based on the above findings, it has been universally concluded that some particular positions on or in the U nearsurface region can be investigated as initial nucleation sites, with the aim of determining the hydriding characteristics. Previous results 11,[17][18][19] also indicate that hydride nucleates at the α-U-U 2 Ti boundary, and that H reacts preferentially with α-U. With regards to the nucleation and growth stage, Hill et al 13 and Scott et al 20 have found the phenomenon of hydride expansion in a particular direction (i.e., twinning).…”

Section: Introductionmentioning

confidence: 93%

“…Thus, H-induced U corrosion follows a localized, spatially heterogeneous, and random pattern of hydride initiation. 3,4,10,11 Metallic U is in the orthorhombic α-phase with significant anisotropy, and the bulk material contains many defects including macro-scale inclusions and micro-scale boundaries, vacancies, and impurities. Investigations of H-induced metallic U corrosion and its alloys have provided evidences that each of the above-mentioned defect types provides a corrosion initiation site for hydride.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of surface uranium hydride formation during corrosion of uranium

Pan

et al. 2019

npj Mater Degrad

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Uranium is widely used in the nuclear industry and it is well known that uranium hydride, UH 3 , forms when uranium is exposed to air. The associated volume change during this transition can cause the surface region to crack, compromising structural integrity. Here, hydriding regions beneath hydride surface craters are studied by secondary ion mass spectroscopy (SIMS) and X-ray photoelectron spectroscopy (XPS). Our results indicate that strain transition regions exist, which are induced by hydrogen with a certain thickness between hydride craters and the uranium bulk. The SIMS and XPS results suggest that hydrogen exists covalently with uranium and oxygen in these transition regions. A micro-scale induction period model based on the transition region and previous hydriding models is developed. Within the so-called micro-scale induction period, hydrogen diffuses and accumulates at particular sites before reaching the critical concentration required to form stoichiometric UH 3 in the transition regions.

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“…For example, U-Mo alloys firstly studied by Argonne National Laboratory present a good radiation resistance (Wiencek and Prokofiev, 2000;Hofman et al, 2003). Small amounts of Ti can improve the mechanical properties and the corrosion resistance of U-Ti alloys, which are considered as substitutes for W alloys (Zurek, 1994;Zurek, 1999;Shi et al, 2015;Li et al, 2020). U-Nb alloys with moderate Nb contents keep a high density compared to the pure U metals and show a good corrosion resistance (Manner et al, 1999;Orlov, 2002).…”

Section: Introductionmentioning

confidence: 99%

Origin of Local Structures of U-Co Melts: A First-Principles Study

Zhang

Sun

et al. 2022

Front. Mater.

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The local structures of U-Co melts have been studied by first-principle calculations. Two sub-peaks are observed in the first peaks of U-U pair distribution functions. The Voronoi polyhedral analyses also show two separate core-shell U-U distances. Therefore, the calculated results propose that U atoms will play dual roles, “chemical” and “topological”, in the local structures of U-Co melts. In addition, the chemical effect of U atoms will be strengthened when containing more U atoms. The interaction of Co and U atoms is slightly affected by the compositions. The Co-centered clusters are mostly prism-like or antiprism-like polyhedral, which can be predicted by the solute-solvent model. The distribution of the coordinated numbers of Co atoms is much narrower than that of U atoms, showing relatively stable Co-centered clusters. The chemical and topological roles of U atoms are intuitively observed in the electron density of U-Co melts, which presents both metallic and covalent bonding characteristics for U-U bonds. In the end, we conclude that the partial localization of U 5f-electron is responsible for the dual roles of U atoms. The present results provide a theoretical understanding of the origin of the local structures of U-Co melts.

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Effect of alloyed Ti on the microstructure and corrosion characteristics of a U–Ti alloy in a hydrogen environment

Cited by 13 publications

References 24 publications

Corrosion resistance of Al₂O₃‐Y₂O₃‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

Corrosion resistance of Al₂O₃‐Y₂O₃‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

Mechanism of surface uranium hydride formation during corrosion of uranium

Origin of Local Structures of U-Co Melts: A First-Principles Study

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Effect of alloyed Ti on the microstructure and corrosion characteristics of a U–Ti alloy in a hydrogen environment

Cited by 13 publications

References 24 publications

Corrosion resistance of Al2O3‐Y2O3‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

Corrosion resistance of Al2O3‐Y2O3‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

Mechanism of surface uranium hydride formation during corrosion of uranium

Origin of Local Structures of U-Co Melts: A First-Principles Study

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Product

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Corrosion resistance of Al₂O₃‐Y₂O₃‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

Corrosion resistance of Al₂O₃‐Y₂O₃‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition