Origin of the hydrogen involved in iron corrosion under irradiation

Lapuerta, S.; Millard-Pinard, N.; Moncoffre, N.; Bérerd, N.; Jaffrézic, H.; Brunel, G.; Crusset, Didier; Mennecart, Thierry

doi:10.1016/j.surfcoat.2006.01.094

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…The corrosion rates of iron and steel have been shown to increase in the presence of radiation. The effect of irradiation is higher in solutions that are less basic (lower pH) and have lower ionic strength [27], as well as in solutions with higher oxygen content [29]. The effects of radiation are attributed to changes in the solution chemistry due to radiolysis of the water.…”

Section: Corrosionmentioning

confidence: 99%

Corrosion in Nuclear Waste Containers

Fergus

2013

ECS Trans.

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One of the challenges for the continued use and expansion of nuclear power generation is the disposal of radioactive waste materials. The long lifetimes require the identification of stable geological formations with non-aggressive environments, combined with engineered multi-barrier containment systems. In this paper, the corrosion behavior of alloys used in containment systems for storage of nuclear waste in geological sites will be reviewed.

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Section: Corrosionmentioning

confidence: 99%

Corrosion in Nuclear Waste Containers

Fergus

2013

ECS Trans.

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“…We also did not account for H 2 production by the radiolysis of water (Lapuerta et al, 2007). In addition, the produced H 2 could become a donor for other redox reactions and thus would be in part consumed.…”

Section: Assumptions and Limitationsmentioning

confidence: 99%

Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effects

Senger²,

Finsterle

2008

Applied Geochemistry

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Abstract. Corrosion of steel canisters, stored in a repository for spent fuel and high-level nuclear wastes, leads to the generation and accumulation of hydrogen gas in the backfilled emplacement tunnels, which may significantly affect long-term repository safety. Previous studies used H 2 generation rates based on the volume of the waste or canister material and the stochiometry of the corrosion reaction. However, iron corrosion and H 2 generation rates vary with time, depending on factors such as amount of iron, water availability, water contact area, and aqueous and solid chemistry. To account for these factors and feedback mechanisms, we developed a chemistry model related to iron corrosion, coupled with two-phase (liquid and gas) flow phenomena that are driven by gas-pressure buildup associated with H 2 generation and water consumption. Results indicate that by dynamically calculating H 2 generation rates based on a simple model of corrosion chemistry, and by coupling this corrosion reaction with two-phase flow processes, the degree and extent of gas pressure buildup could be much smaller compared to a model that neglects the coupling between flow and reactive transport mechanisms. By considering the feedback of corrosion chemistry, the gas pressure increases initially at the canister, but later decreases and eventually returns to a stabilized pressure that is slightly higher than the background pressure. The current study focuses on corrosion under anaerobic conditions for which the coupled hydrogeochemical model was used to examine the role of selected physical parameters on the H 2 gas generation and corresponding pressure buildup in a nuclear waste repository. The developed model can be applied to evaluate the effect of water and mineral chemistry of the buffer and host rock on the corrosion reaction for future site-specific studies.

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“…In this aim, the iron based materials have been studied under pure iron [2,3], low alloy and stainless steel [1,4,5] regarding the using ever in the nuclear reactors, in the radioactive waste transport or storage/disposal.…”

Section: Introductionmentioning

confidence: 99%

“…Disregarding the high number of publications about the corrosion of these materials with [2][3][4][5][6][7][8][9][10] or without [11][12][13][14] irradiation, the combination of iron corrosion and water radiolysis mechanisms have not sufficiently been investigated in order to understand the part of each chemical processing. Moreover, much papers deal with the iron corrosion products under atmospheric conditions [2,3,11], anoxic [6,15] or both [4] and a few of them under nuclear reactors conditions [5,7,16]. These works have performed characterization of the iron corrosion products with different spectroscopic tools such as Raman vibrational spectroscopy by in situ [12] or ex situ [14,15,[17][18][19][20] experiments.…”

Section: Introductionmentioning

confidence: 99%

“…The  ( 4 He 2+ ) radiolysis of water mainly induces molecular species such as H 2 and H 2 O 2 [16,[22][23][24]. The hydrogen gas produced by the water radiolysis, in particular at the solid/solution interface in the case of Fe [2,4,5], Zr [25][26][27], Si [28][29][30], Ti [31], Ce [26,27] or U [27] oxides could be considered as one possible relevant future source of energy and then consists as a new field of fundamental investigations. Most the pre-quoted works systems oxides/water has shown an increase of the H 2 radiolytic yield regarding the pure water system.…”

Section: Introductionmentioning

confidence: 99%

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Alpha localized radiolysis and corrosion mechanisms at the iron/water interface: Role of molecular species

Vandenborre

Crumière

Blain

et al. 2013

Journal of Nuclear Materials

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This paper is devoted to the iron corrosion phenomena induced by the α (4He2+) water radiolysis species studied in conjunction with the production/consumption of H2 at the solid/solution interface. On one hand, the solid surface is characterized during the 4He2+ ions irradiation by in situ Raman spectroscopy; on another hand, the H2 gas produced by the water radiolysis is monitored by ex situ gas measurements. The 4He2+ ions irradiation experiments are provided either by the CEMHTI (E = 5.0 MeV) either by the ARRONAX (E = 64.7 MeV) cyclotron facilities. The iron corrosion occurs only under irradiation and can be slowed down by H2 reductive atmosphere. Pure iron and carbon steel solids are studied in order to show two distinct behaviors of these surfaces vs. the 4He2+ ions water irradiation: the corrosion products identified are the magnetite phase (Fe(II)Fe(III)2O4) correlated to an H2 consumption for pure iron and the lepidocrocite phase (γ-Fe(III)OOH) correlated to an H2 production for carbon steel sample. This paper underlined the correlation between the iron corrosion products formation onto the solid surface and the H2 production/consumption mechanisms. H2O2 species is considered as the single water radiolytic species involved into the corrosion reaction at the solid surface with an essential role in the oxidation reaction of the iron surface. We propose to bring some light to these mechanisms, in particular the H2 and H2O2 roles, by the in situ Raman spectroscopy during and after the 4He2+ ions beam irradiation. This in situ experiment avoids the evolution of the solid surface, in particular phases which are reactive to the oxidation processing

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Origin of the hydrogen involved in iron corrosion under irradiation

Cited by 10 publications

References 8 publications

Corrosion in Nuclear Waste Containers

Corrosion in Nuclear Waste Containers

Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effects

Alpha localized radiolysis and corrosion mechanisms at the iron/water interface: Role of molecular species

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