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Influence of halide ions and alloy microstructure on the passive and localized corrosion behavior of alloy 22

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Abstract

Alloy 22 (N06022) is the current candidate alloy used to fabricate the external wall of the high-level nuclear waste containers for the Yucca Mountain repository. It was of interest to study and compare the general and localized corrosion susceptibility of Alloy 22 in fluoride and chloride solutions at 90 °C. Standard electrochemical tests such as cyclic potentiodynamic polarization, amperometry, and electrochemical impedance spectroscopy were used. Studied variables included the solution pH and the alloy microstructure (thermal aging). Results show that Alloy 22 is highly resistant to general corrosion in all the solutions tested. Thermal aging is not detrimental and even seems to be slightly beneficial for general corrosion at the higher solution pHs. Pitting corrosion was never observed. Crevice corrosion was found only for high chloride-containing solutions after anodic polarization. The presence of fluoride ions together with chloride ions seems to increase the susceptibility of Alloy 22 to crevice corrosion compared to pure chloride solutions.

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Authors and Affiliations

  1. the Argentine Atomic Energy Commission, 1650, San Martin, Buenos Aires, Argentina

    Martín A. Rodríguez (Researcher) & Ricardo M. Carranza (Principal Investigator)

  2. Lawrence Livermore National Laboratory, 94550, Livermore, CA

    Raúl B. Rebak (Corrosion Scientist)

Authors
  1. Martín A. Rodríguez
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  2. Ricardo M. Carranza
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  3. Raúl B. Rebak
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Additional information

This article is based on a presentation made in the symposium “Effect of Processing on Materials Properties for Nuclear Waste Disposition,” November 10–11, 2003, at the TMS Fall meeting in Chicago, Illinois, under the joint auspices of the TMS Corrosion and Environmental Effects and Nuclear Materials Committees.

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Rodríguez, M.A., Carranza, R.M. & Rebak, R.B. Influence of halide ions and alloy microstructure on the passive and localized corrosion behavior of alloy 22. Metall Mater Trans A 36, 1179–1185 (2005). https://doi.org/10.1007/s11661-005-0210-4

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  • DOI: https://doi.org/10.1007/s11661-005-0210-4

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