Changes in the state of iron atoms in Zr alloys during corrosion tests in an autoclave

Filippov, V. P.; Bateev, A. B.; Lauer, Yu. A.; Каргин, Н.; Петров, В. И.

doi:10.1007/s10751-013-0970-y

Cited by 4 publications

(2 citation statements)

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“…Mössbauer spectra of 119 Sn in oxide films grown on Zr-0.76Fe-1.6Sn are shown in The previous results of Mössbauer studies [2,[23][24][25] at liquid nitrogen temperature (77 K) showed that the intensity of the identified line increased. Large variations of the resonance absorption, and as a consequence a large increase in line intensity, are characteristic of β-Sn [2,[23][24][25][26]. The variation of the resonance absorption probability in the 78-300 K temperature interval for this phase turned out to be close in magnitude to the variations of f' that were also observed for metallic tin (β-Sn).…”

Section: Mössbauer Investigationsmentioning

confidence: 71%

“…In our investigations we revealed that oxides obtained in reactor conditions contain small quantities of β-Sn. These precipitates, as the authors of references [2,22,25,26] assume, have a positive, slowing effect on the corrosion process. In the oxide films obtained in reactor irradiation conditions, most tin is found as SnO 2 and SnO, correlating directly to the accelerated oxidation kinetics compared to autoclave exposures.…”

Section: Discussionmentioning

confidence: 92%

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The influence of reactor irradiation on the oxidation state of tin in Zr-0.76Fe-1.6Sn

et al. 2018

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The oxidation states of minor alloying elements in Zircaloys often determine their resistance to corrosion, especially in reactors. In particular, tin is of interest because of its near ubiquitous use in earlier Zircaloys. To study changes in the oxidation state of tin under irradiation, specimens of Zr-0.76Fe-1.6Sn were corroded at similar conditions in an autoclave and in a nuclear reactor. Corrosion rates were found to be significantly accelerated following irradiation compared to those in the autoclave. Mössbauer spectroscopy revealed that in both the autoclave conditions and reactor conditions, a combination of tetravalent, divalent, and elemental (β-Sn) tin particles are formed during the initial corrosion processes. The kinetics of both the change in tin oxidation state and the corrosion rate in-reactor are greatly accelerated, pointing to the effect of irradiation driving tin into solution more quickly.

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