Self-accelerated corrosion of nuclear waste forms at material interfaces

Guo, Xiaolei; Gin, Stéṕhane; Lei, Penghui; Yao, Tiankai; Liu, Hongshen; Schreiber, Daniel K.; Ngo, Dien; Viswanathan, G.B.; Li, Tianshu; Kim, Seong H.; Vienna, John D.; Ryan, Joseph V.; Du, Jincheng; Lian, Jie; Frankel, G. S.

doi:10.1038/s41563-019-0579-x

Cited by 71 publications

(68 citation statements)

References 21 publications

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“…For each sample, XPS spectra were obtained from three different locations: the crevice mouth, crevice center, and the noncontact back side. In the previous paper 16 , it was shown that, as a result of SS crevice corrosion, localized acidic attack was observed in the crevice mouth area of the ISG(+SS NaCl ), where depletion of all major elements except for Si occurred. On the non-contact side of ISG(+SS NaCl ), Na and Ca were both depleted due to ion exchange, while Zr and Al were slightly enriched.…”

Section: Chemical Compositions Of Altered Isgmentioning

confidence: 97%

“…To simulate the corrosion of metal canisters and nuclear waste glass under accelerated conditions, different materials were pressed against each other and corroded in 0.6 M NaCl solution or DI water at 90°C. Although the initial ionic strength may be lower in the actual repository conditions, Cl − and Na + ions are likely to be enriched at the material interface during corrosion 16 . The complete experimental groups are listed in Table 1.…”

Section: Corrosion Of Soda-lime Silica Glassmentioning

confidence: 99%

“…Therefore, a model nuclear waste glass, ISG 19 , was studied. The corrosion behavior of this SS + ISG system has been partially described in a previous paper 16 . More results are provided in this study.…”

Section: Corrosion Of Isgmentioning

confidence: 99%

“…We recently described the corrosion interactions between a more realistic SS canister material and a model nuclear waste glass, international simple glass (ISG), under accelerated conditions by pressing the two materials against each other and immersing the assembly in NaCl solution at 90°C. 16 In addition to the precipitation of Fe-silicates, new mechanisms were revealed. The crevice corrosion of SS resulted in an aggressive acidic environment that could significantly enhance the corrosion of ISG present nearby.…”

Section: Introductionmentioning

confidence: 99%

“…Alloy G30 and alloy 625 were selected due to their superior corrosion resistance compared to SS 21 . We have shown that SS crevice corrosion could accelerate the degradation of nearby ISG 16 , so it would be of interest to explore the corrosion interactions between the model glass and these more corrosion resistant alloys.…”

Section: Introductionmentioning

confidence: 99%

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Near-field corrosion interactions between glass and corrosion resistant alloys

et al. 2020

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This study explores the corrosion interactions between model nuclear waste glass materials and corrosion resistant alloys, under accelerated conditions that simulate the near field of a nuclear waste repository. The interactions between the corrosion of stainless steel (SS) 316, alloy G30, or alloy 625, and international simple glass or soda-lime silica glass are systematically studied. The dissimilar materials were exposed in close proximity to each other in different electrolytes at 90°C. After exposure, the glass surface exposed near metals showed different regimes of corrosion, with distinct surface morphologies and chemistries that were likely affected by the local environment created by the localized corrosion of metals. Surface and solution analyses showed that the corrosion rate of glass was enhanced by the presence of metals. Infrared spectroscopy data suggested the local build-up of stresses in the contact area of glass, which may lead to the mechanical instability of the glass alteration layer. On the other hand, the effect of glass on metal corrosion is strongly dependent on the leaching solution. In electrolytes containing abundant aggressive anions such as Cl − , glass seems to suppress the localized corrosion of SS by the precipitation of a Si-rich surface film that protects the SS substrate from solutions. However, in less aggressive electrolytes, the corrosion rate of SS was increased by the presence of glass corrosion products. Overall, our study showed that the hidden and localized damage on glass in contact with metals may enhance the release rate of glass components compared to typical uniform glass corrosion.

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Section: Chemical Compositions Of Altered Isgmentioning

confidence: 97%

Section: Corrosion Of Soda-lime Silica Glassmentioning

confidence: 99%

Section: Corrosion Of Isgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Near-field corrosion interactions between glass and corrosion resistant alloys

et al. 2020

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References

2021

Management of Radioactive Waste

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Morphogenic Modeling of Corrosion Reveals Complex Effects of Intermetallic Particles

Batista,

Romanovskaia,

Romanovski

et al. 2024

Advanced Science

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Corrosion processes are often discussed as stochastic events. Here, it is shown that some of these seemingly random processes are not driven by nanoscopic fluctuations but rather by the spatial distribution of micrometer‐scale heterogeneities that trigger fast reactions associated with corrosion. Using a novel excitable reaction‐diffusion model, corrosion waves traveling over the metal surface and the associated material loss are described. This resulting nonuniform corrosion penetration, seen as a height loss in modeling, exposes buried intermetallic particles, which depending on the local electrochemical state of the surface trigger or block new waves. Informed by quantitative experimental data for the Mg–Al–Zn alloy AZ31B, wave speeds, wave widths, and average material loss are accurately captured. Morphogenic mitigation based on wave‐breaking microparticles is also simulated. While AZ31B corrosion is identified as a process driven by rare‐wave events, this study predicts several other corrosion regimes that proceed via spots or patchy patterns, opening the door for new protection, design, and prediction strategies.

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Self-accelerated corrosion of nuclear waste forms at material interfaces

Cited by 71 publications

References 21 publications

Near-field corrosion interactions between glass and corrosion resistant alloys

Near-field corrosion interactions between glass and corrosion resistant alloys

References

Morphogenic Modeling of Corrosion Reveals Complex Effects of Intermetallic Particles

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