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Passive Corrosion Behavior of Alloy 22 in Multi-Ionic Aqueous Environments

[+] Author Affiliations
Tiangan Lian, John C. Estill, Gary A. Hust, Dave V. Fix, Raul B. Rebak

Lawrence Livermore National Laboratory, Livermore, CA

Paper No. PVP2002-1615, pp. 67-74; 8 pages
doi:10.1115/PVP2002-1615
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Transportation, Storage, and Disposal of Radioactive Materials
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4660-1
  • Copyright © 2002 by ASME

abstract

As part of proposed geological repository at Yucca Mountain, Nevada, Alloy 22 (Ni-22Cr-13Mo-3W-3Fe) has been chosen as the candidate material for a 2-cm outer layer on the high-level nuclear waste containers. During the repository period, the container materials will be subject to corrosion due to their exposure to multi-ionic aqueous environments. Although Alloy 22 has demonstrated excellent corrosion resistance, accumulation of a small, yearly corrosion rate for 10,000 or more years can be significant. When subjected to the conventional weight loss technique for corrosion studies, Alloy 22 requires many years to demonstrate a detectible weight loss. The goal of this research is to seek alternative techniques to determine a reasonably confident corrosion rate. This paper will discuss the latest experimental results using the potentiostatic technique to determine passive dissolution rates.

Copyright © 2002 by ASME
Topics: Alloys , Corrosion

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