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Influence of Primary Water Chemistry on Oxides Formed on Alloy 600 and Alloy 690

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Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors

Abstract

The results of in situ SERS investigations of Alloys’ 600 and 690 surface films were combined with the results of a number of ex situ studies conducted by other researchers who used a variety of experimental techniques. Comparing the results of different investigations revealed the surface films’ composition and microstructure were most sensitive to alloy composition and the concentrations of aqueous metal cations (especially Fe+2).

Earlier studies established that the films typically consist of two layers and that saturation concentrations of (Ni++)aq and (Fe+z)aq affect the composition and crystal structure of the films’ outer layers. The current investigation indicates that aqueous Ni++ and Fe+2 also affect the composition and structure of the surface films’ inner layers.

The faces of intergranular stress corrosion cracks exhibit oxides that are different from the oxides formed on free surfaces. The crack faces are covered by MA600O and MA690O. It is proposed that nickel is oxidized inside intergranular stress corrosion cracks (but not on free surfaces) because of (1) alkalization of the crack’s water due to the removal of aqueous boron species by their adsorption/precipitation on oxide, and (2) galvanic coupling of cracks to free surfaces, which is made possible by the water’s electrical conductivity (largely due to Li+).

Diffusion Path Analyses is able to qualitatively explain the effects of alloy composition and water chemistry on film microstructure. Earlier studies of the adsorption of aqueous, heavy metal cations onto colloidal oxide particles provide insight into the mechanism by which (Fe+z)aq, (Ni++)aq, and aqueous boron species change the inner layer of the oxide films formed on Alloy 600 and Alloy 690. The present results are relevant to SCC of Alloys 600 and 690 and to cation release from Alloys 600 and 690.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of California, Berkeley, California, USA

    Thomas M. Devine

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  1. Thomas M. Devine
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Editors and Affiliations

  1. Oak Ridge National Laboratory, USA

    Jeremy T. Busby

  2. Electric Power Research Institute, USA

    Gabriel Ilevbare

  3. GE Global Research Center, USA

    Peter L. Andresen

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© 2011 TMS (The Minerals, Metals & Materials Society)

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Devine, T.M. (2011). Influence of Primary Water Chemistry on Oxides Formed on Alloy 600 and Alloy 690. In: Busby, J.T., Ilevbare, G., Andresen, P.L. (eds) Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors. Springer, Cham. https://doi.org/10.1007/978-3-319-48760-1_59

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