Hydrogen pickup measurements in zirconium alloys: Relation to oxidation kinetics

Couet, Adrien; Motta, Arthur T.; Comstock, R. J.

doi:10.1016/j.jnucmat.2014.03.001

Cited by 124 publications

(88 citation statements)

References 30 publications

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“…It was inferred in [9] that the rapid sudden increase in hydrogen pick-up fraction (HPUF) on approaching transition [24,25] is associated with the formation of pores that build from the metal/oxide interface. Thus, the avalanche in hydrogen pick-up fraction was taken to reflect such pore formation, a symptom rather than the cause of barrier oxide breakdown.…”

Section: Discussionmentioning

confidence: 99%

“…A symptom of the oxide dissolution process is neutral oxygen vacancies accumulation, super-saturation, and possible hydrogen-assisted nucleation late in each cycle. The formation of pores was taken to offer easy paths for short-circuiting hydrogen transport through the oxide [9,23], resulting in the avalanching hydrogen pick-up [24] reported to precede the breakdown of the barrier oxide, the latter resulting from increased loss of mechanical integrity of the barrier oxide.…”

Section: Emerging Understandingmentioning

confidence: 99%

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Oxygen Vacancy Formation, Mobility, and Hydrogen Pick-up during Oxidation of Zirconium by Water

Lindgren

Panas

2017

Oxid Met

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A comprehensive first principles understanding of the oxidation of zirconium alloys by water was reiterated. Two channels were taken to jointly constitute to the oxidation process: one according to classical oxidation theory involving hydrogen evolution and the second reflected by inwards transport of protons causing hydrogen pick-up. The two were associated with charged and uncharged oxygen vacancies, respectively. The purpose of the present study was to clarify the nature of the effective anode during oxidation of zirconium as to the detailed role of the metal. Oxygen dissolution in the alloy resulted in a ''pre-anodic'' property associated with the formation of oxygen vacancy V O in the oxide, i.e., preceding V O 2? /2e -separation. Atomistic perspective on the metal/oxide interface before nucleation of V O was provided. The rapid convergence of the model interface to bulk properties in spite of the local structural variability provided new insight as to the nature of an amorphous metal/oxide interface.

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Section: Discussionmentioning

confidence: 99%

Section: Emerging Understandingmentioning

confidence: 99%

Oxygen Vacancy Formation, Mobility, and Hydrogen Pick-up during Oxidation of Zirconium by Water

Lindgren

Panas

2017

Oxid Met

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“…In such cracks, hydrogen was strongly enriched [47]. At small protective oxide thickness, a fraction of absorbed hydrogen increased with exposure time, then reached a plateau, started to increase again reaching a peak and decreased [48].…”

Section: Oxides and Hydrogen Entrymentioning

confidence: 99%

Hydrogen degradation of pre-oxidized zirconium alloys

Szoka

Gajowiec

Zieliński

et al. 2017

Advances in Materials Science

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The presence of the oxide layers on Zr alloys may retard or enhance the hydrogen entry and material degradation, depending on the layer features. This research has been aimed to determine the effects of preoxidation of the Zircaloy-2 alloy at a different temperature on hydrogen degradation. The specimens were oxidised in laboratory air at 350ºC, 700ºC, and 900ºC. After, some samples were tensed at 10-5 strain rate and simultaneously charged with hydrogen under constant direct voltage in 1 N sulfuric acid at room temperature. Other specimens were charged without any tension, then annealed at 400ºC for 4 h and finally tensed at above strain rate. The SEM examinations were performed on the cross-sections and fracture faces of specimens. The obtained results demonstrate the effects of the oxide layer on the cathodic current and hydrogen entry, mechanical properties and the appearance of hydrides and fracture behaviour.

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“…Recent studies have discovered that H pickup process also follows the oxidation periodicity 12,13 . Besides the oxide morphology, additive elements (e.g., Fe, Cr, Nb, Sn and Ni) in different Zr alloys have substantial effects on the H pickup fraction.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. 12 , the samples of Zry-4 and ZIRLO were processed in both sheet and tube form in order to test whether the sample geometry could affect the H pickup process. These data are also included and compared in this work.…”

Section: Introductionmentioning

confidence: 99%

Continuum model for hydrogen pickup in zirconium alloys of LWR fuel cladding

Wang

Zheng

Szlufarska

et al. 2017

Journal of Applied Physics

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A continuum model for calculating the time-dependent hydrogen pickup fractions in various Zirconium alloys under steam and pressured water oxidation has been developed in this study. Using only one fitting parameter, the effective hydrogen gas partial pressure at the oxide surface, a qualitative agreement is obtained between the predicted and previously measured hydrogen pickup fractions. The calculation results therefore demonstrate that H diffusion through the dense oxide layer plays an important role in the hydrogen pickup process. The limitations and possible improvement of the model are also discussed.

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Hydrogen pickup measurements in zirconium alloys: Relation to oxidation kinetics

Cited by 124 publications

References 30 publications

Oxygen Vacancy Formation, Mobility, and Hydrogen Pick-up during Oxidation of Zirconium by Water

Oxygen Vacancy Formation, Mobility, and Hydrogen Pick-up during Oxidation of Zirconium by Water

Hydrogen degradation of pre-oxidized zirconium alloys

Continuum model for hydrogen pickup in zirconium alloys of LWR fuel cladding

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