Long Term Corrosion Potential Behavior of Alloy 22 in Yucca Mountain Relevant Environments
The approach of isolating high-level nuclear waste in the designated site of Yucca Mountain (Nevada) is to separate it from the environment using a series of engineering and natural barriers. The container for the waste will consist of two concentric metal cylinders. The outer cylinder is going to be fabricated of Alloy 22 (N06022). If water is present at the site, several corrosion processes may occur. These include passive or general corrosion, localized corrosion and environmentally assisted cracking. The occurrence of one (or more) mode of corrosion over another will be determined by the redox potential of the aqueous electrolyte that may enter in contact with the container. This redox potential will also control the corrosion potential (E{sub corr}) of the container. This paper summarizes the findings of an extensive laboratory testing aimed at measuring E{sub corr} of Alloy 22 in presence of a variety of electrolyte solutions. Some of these solutions are multi-ionic electrolytes that may simulate concentrated ground waters. Other environments are chemical solutions of pure salts, which are highly unlikely for an underground repository but that may establish an extreme bounding condition. Current results show that the highest measured potential for Alloy 22 was approximately +0.3 to 0.4 V in the saturated silver chloride [SSC] scale. Most of the E{sub corr} values are in the order of 0 V [SSC] or below.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15004904
- Report Number(s):
- UCRL-JC-150083; TRN: US0305201
- Resource Relation:
- Conference: National Association of Corrosion Engineers International Meeting CORROSION/03, San Diego, CA, Mar 16 - Mar 20, 2003; Other Information: National Association of Corrosion Engineers International Meeting CORROSION/03; San Diego, CA (US); 03/16/2003--03/20/2003; PBD: 18 Sep 2002
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
29 ENERGY PLANNING
POLICY AND ECONOMY
43 PARTICLE ACCELERATORS
58 GEOSCIENCES
ALLOYS
CONTAINERS
CORROSION
ELECTROLYTES
ENGINEERS
GROUND WATER
RADIOACTIVE WASTES
REDOX POTENTIAL
SILVER CHLORIDES
SUPERCONDUCTING SUPER COLLIDER
TESTING
WASTES
WATER
YUCCA MOUNTAIN