Corrosion Rates of Zircaloy-4 by Hydrogen Measurement under High pH, Low Oxygen and Low Temperature Conditions

Sakuragi, Tomofumi; Miyakawa, Hideaki; Nishimura, Takuya; Tateishi, Tsuyoshi

doi:10.1557/opl.2012.592

Cited by 7 publications

(1 citation statement)

References 2 publications

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“…It is considered that the ratio of absorbed hydrogen to generated hydrogen decreases with temperature, because the ratio observed at 80-120uC and 30uC were 70-75% and 90%, respectively. 5,13 The detection limit of the electric balance used in the test: 0?01 mg is much less than the total weight gain of the specimens during the corrosion test; 0?72-1?52 mg. Although the weight gain of the specimens includes a weight of absorbed hydrogen in Zircaloy, the fraction is negligibly small.…”

Section: R E T R a C T E Dmentioning

confidence: 99%

RETRACTED ARTICLE: Consideration on application of empirical corrosion rate model of Zircaloy at 280–400°C to deep underground temperature

2014

Corrosion Engineering, Science and Technology

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Corrosion tests were conducted using Zircaloy-4 specimens in deaerated and deionised water at 180uC by both a hydrogen generation rate method and a weight gain measurement method in order to confirm applicability of an empirical corrosion rate model at 280-400uC to a lower temperature. The corroded Zircaloy surface was characterised to be a thin crystalline ZrO 2 film. The corrosion depth of Zircaloy grew in accordance with a cubic rate law in the same way as at 280-400uC and at 80-120uC. The cubic rate corrosion constants at 180uC fell on the linear interpolation between 280-400uC and 80-120uC on the Arrhenius plot. The good fit of the data and the fact that a very similar activation energy is observed suggest that the same corrosion mechanism is occurring over the temperature range 80-400uC and the empirical corrosion rate model of Zircaloy at the higher temperature would be applicable to the lower temperature range.

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Section: R E T R a C T E Dmentioning

confidence: 99%

RETRACTED ARTICLE: Consideration on application of empirical corrosion rate model of Zircaloy at 280–400°C to deep underground temperature

2014

Corrosion Engineering, Science and Technology

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Study of stainless steel corrosion by hydrogen measurement under deoxygenated, low-temperature and basic repository conditions

Sakuragi¹,

Yoshida²,

Katoh

et al. 2016

Progress in Nuclear Energy

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Long-term Corrosion of Zircaloy-4 and Zircaloy-2 by Continuous Hydrogen Measurement under Repository Condition

Sakuragi¹,

Miyakawa²,

Nishimura

et al. 2013

MRS Proc.

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Corrosion behavior is a key issue for the waste disposal of irradiated metals, such as hulls and endpieces, and is considered to be a leaching source of radionuclides including C-14. However, little information about Zircaloy corrosion in anticorrosive conditions has been provided.In the present study, long-term corrosion tests of Zircaloy-4 and Zircaloy-2 were performed in assumed disposal conditions (dilute NaOH solution, pH 12.5, 303 K) by using the gas flow system for 1500 days. The corrosion rate, which was determined by measuring gaseous hydrogen and the hydrogen absorbed in Zircaloy, decreased with immersion time and was lower than the value of 2×10−2 μm/y used in performance assessment (1500-day values: 5.84×10−3 and 5.66×10−3 μm/y for Zircaloy-4, 1000-day values: 8.81×10−3 μm/y for Zircaloy-2). The difference in corrosion behavior between Zircaloy 4 and Zircaloy-2 was negligible. The average values of the hydrogen absorption ratios for Zircaloy-4 and Zircaloy-2 during corrosion were 91% and 94%, respectively.The hydrogen generation kinetics of both gas evolution and absorption into metal can be shown by a parabolic curve. This result indicates that the diffusion process controls the Zircaloy corrosion in the early corrosion stage of the present study, and that the thickness of the oxide film in this stage is limited to approximately 25 nm and may therefore be in the form of dense tetragonal zirconia.

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Corrosion Rates of Zircaloy-4 by Hydrogen Measurement under High pH, Low Oxygen and Low Temperature Conditions

Cited by 7 publications

References 2 publications

RETRACTED ARTICLE: Consideration on application of empirical corrosion rate model of Zircaloy at 280–400°C to deep underground temperature

RETRACTED ARTICLE: Consideration on application of empirical corrosion rate model of Zircaloy at 280–400°C to deep underground temperature

Study of stainless steel corrosion by hydrogen measurement under deoxygenated, low-temperature and basic repository conditions

Long-term Corrosion of Zircaloy-4 and Zircaloy-2 by Continuous Hydrogen Measurement under Repository Condition

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