Electrochemical Testing of Ni-Cr-Mo-Gd Alloys
The waste package site recommendation design specified a boron-containing stainless steel, Neutronit 976/978, for fabrication of the internal baskets that will be used as a corrosion-resistant neutron-absorbing material. Recent corrosion test results gave higher-than-expected corrosion rates for this material. The material callout for these components has been changed to a Ni-Cr-Mo-Gd alloy (ASTM-B 932-04, UNS N06464) that is being developed at the Idaho National Laboratory. This report discusses the results of initial corrosion testing of this material in simulated in-package environments that could contact the fuel baskets after breach of the waste package outer barrier. The corrosion test matrix was executed using the potentiodynamic and potentiostatic electrochemical test techniques. The alloy performance shows low rates of general corrosion after initial removal of a gadolinium-rich second phase that intersects the surface. The high halide-containing test solutions exhibited greater tendencies toward initiation of crevice corrosion.
- Research Organization:
- Idaho National Laboratory (INL)
- Sponsoring Organization:
- DOE - RW
- DOE Contract Number:
- AC07-99ID13727
- OSTI ID:
- 911252
- Report Number(s):
- INL/EXT-05-00713
- Country of Publication:
- United States
- Language:
- English
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