Role of proton irradiation and relative air humidity on iron corrosion

Lapuerta, S.; Moncoffre, N.; Millard-Pinard, N.; Jaffrézic, H.; Bérerd, N.; Crusset, Didier

doi:10.1016/j.jnucmat.2006.02.051

Cited by 13 publications

(8 citation statements)

References 8 publications

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“…Those results demonstrate the increase of iron corrosion by the joint effect of oxygen and water and the main influence of wet-dry cycles. In a previous work [2], we also showed that, under irradiation, a combination of oxygen and water molecules is needed to create a rust layer at room temperature. During storage and the first reversible period of the deep geological repository, there will be no wet-dry cycle.…”

Section: Introductionmentioning

confidence: 62%

“…The experimental set-up presented in Fig. 1 was described previously [2]. The beam is extracted from the vacuum by a 5-lm-thick Havar window and penetrates in the irradiation cell through the iron foil.…”

Section: Irradiation Conditionsmentioning

confidence: 99%

“…RH is fixed according to the following set-up [2]: dry gas (20% O 2 + 80% N 2 , or 100% N 2 ) is supplied from a bottle, whose flow is regulated by a manometer. The dry gas is saturated with water through a bubbling system and is adjusted to the proper RH value by using an alumina trap.…”

Section: Irradiation Conditionsmentioning

confidence: 99%

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The influence of relative humidity on iron corrosion under proton irradiation

Lapuerta

Bérerd

Moncoffre

et al. 2008

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 62%

Section: Irradiation Conditionsmentioning

confidence: 99%

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The influence of relative humidity on iron corrosion under proton irradiation

Lapuerta

Bérerd

Moncoffre

et al. 2008

Journal of Nuclear Materials

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“…The key parameter influencing the improvement of reactivity of the surface stabilized nZVI particles during the activation process is the increase in the density of defects in the oxide shell [48]. Therefore, if the density of defects is constant, the increase of new surfaces is significant for the reactivity and therefore an increase in the SSA would result in an increase in the capacity of Cr(VI) removal [18].…”

Section: Reduction Of Cr(vi)mentioning

confidence: 99%

Activation process of air stable nanoscale zero-valent iron particles

Ribas

Černík

Benito

et al. 2017

Chemical Engineering Journal

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Nanoscale Zero Valent Iron (nZVI) represents a promising material for subsurface water remediation technology. However, dry, bare nZVI particles are highly reactive, being pyrophoric when they are in contact with air. The current trends of nZVI manufacturing lead to the surface passivation of dry nZVI particles with a thin oxide layer, which entails a decrease in their reactivity. In this work an activation procedure to recover the reactivity of air-stable nZVI particles is presented. The method consists of exposing nZVI to water for 36 hours just before the reaction with the pollutants. To assess the increase in nZVI reactivity based on the activation procedure, three types of nZVI particles with different oxide shell thicknesses have been tested for Cr(VI) removal. The two types of air-stable nZVI particles with an oxide shell thickness of around 3.4 and 6.5 nm increased their reactivity by a factor of 4.7 and 3.4 after activation, respectively. However, the pyrophoric nZVI particles displayed no significant improvement in reactivity. The improvement in reactivity is related mainly to the degradation of the oxide shell, which enhances electron transfer and leads secondarily to an increase in the specific surface area of the nZVI after the activation process. In order to validate the activation process, additional tests with selected chlorinated compounds demonstrated an increase in the degradation rate by activated nZVI particles.

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“…Since the oxide layer and SSA values do not account for the high Cr(VI) removal capacity of M48h-Al O , this high efficiency must be more related to two other factors: the first would be an enhanced density of reactive sites in the surface (Lapuerta et al 2006 ), the second would be the internal structure of the nanoparticles (Liu et al 2005a ). In the first point, it has been suggested that the new surfaces created by the fracture of the former particles and the presence of a great amount of irregularities offer a large number of reaction sites, which causes an increase of reactivity (Köber et al 2014 ;Li et al 2009 ).…”

Section: Tablementioning

confidence: 99%

Improvements in nanoscale zero-valent iron production by milling through the addition of alumina

et al. 2016

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A new milling procedure for a cost-effective production of nanoscale zero-valent iron for environmental remediation is presented. Conventional ball milling of iron in an organic solvent as Mono Ethylene Glycol produces flattened iron particles that are unlikely to break even after very long milling times. With the aim of breaking down these iron flakes, in this new procedure, further milling is carried out by adding an amount of fine alumina powder to the previously milled solution. As the amount of added alumina increases from 9 to 54 g l-1, a progressive decrease of the presence of flakes is observed. In the latter case, the appearance of the particles formed by fragments of former flakes is rather homogeneous, with most of the final nanoparticles having an equivalent diameter well below 1 µm and with an average particle size in solution of around 400 nm. An additional increase of alumina content results in a highly viscous solution showing worse particle size distribution. Milled particles, in the case of alumina concentrations of 54 g l-1, have a fairly large specific surface area and high Fe(0) content. These new particles show a very good Cr(VI) removal efficiency compared with other commercial products available. This good reactivity is related to the absence of an oxide layer, the large amount of superficial irregularities generated by the repetitive fracture process during milling and the presence of a fine nanostructure within the iron nanoparticles.Peer ReviewedPreprin

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Role of proton irradiation and relative air humidity on iron corrosion

Abstract: This paper presents a study of the effects of proton irradiation on iron corrosion. Since it is known that in humid atmospheres, iron corrosion is enhanced by the double influence of air and humidity, we studied the iron corrosion under irradiation with a 45% relative humidity.

Cited by 13 publications

References 8 publications

The influence of relative humidity on iron corrosion under proton irradiation

The influence of relative humidity on iron corrosion under proton irradiation

Activation process of air stable nanoscale zero-valent iron particles

Improvements in nanoscale zero-valent iron production by milling through the addition of alumina

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