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Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors pp 1725–1737Cite as

In Situ Electrochemical Study on Crevice Environment of Stainless Steel in High Temperature Water

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Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

In situ electrochemical impedance spectroscopy measurement within crevice of stainless steel in 288 °C water has been conducted to analyze crevice water chemistry. Small sensors (\( {\varphi} {\sim} 250\,\upmu{\text{m}}) \) measured local solution electrical conductivity κ crev, polarization resistance and electrochemical corrosion potential. Real-time response of the κ crev as functions of bulk water conductivity and dissolved oxygen (DO) concentration has been quantitatively analyzed. The κ crev differ more than an order of magnitude depending on the oxygen potential inside the crevice. The κ crev increased with addition of small amount of bulk DO (e.g. 30 ppb). The maximum κ crev was observed with DO of 32,000 ppb and became more than 100 times higher than that of bulk water. The effect of geometrical factors on the crevice environment was also found to play an important role in the water chemistry inside.

18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems—Water Reactors, August 13–17, 2017, Marriott Portland Downtown Waterfront Portland, Oregon, USA.

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Acknowledgements

This study includes the result of collaborative research with Chubu Electric Power Co.

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Authors and Affiliations

  1. Japan Atomic Energy Agency (JAEA), Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

    Y. Soma, C. Kato & F. Ueno

Authors
  1. Y. Soma
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  2. C. Kato
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  3. F. Ueno
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Corresponding author

Correspondence to Y. Soma .

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Editors and Affiliations

  1. Idaho National Laboratory, Idaho Falls, ID, USA

    John H. Jackson

  2. Naval Nuclear Laboratory, Pittsburgh, PA, USA

    Denise Paraventi

  3. Chalk River Laboratories, Canadian Nuclear Laboratories, Chalk River, ON, Canada

    Michael Wright

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© 2019 The Minerals, Metals & Materials Society

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Soma, Y., Kato, C., Ueno, F. (2019). In Situ Electrochemical Study on Crevice Environment of Stainless Steel in High Temperature Water. In: Jackson, J., Paraventi, D., Wright, M. (eds) Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-04639-2_116

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