Electrochemical Corrosion Testing of Neutron Absorber Materials Page: 5 of 28
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Ni5Gd
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Figure 2 : Ni-Cr-Mo-Gd alloy microstructure
ASTM and ASME Standards
The Ni-Cr-Mo-Gd alloy chemistry requirements are defined in ASTM B932-04.Error!
Bookmark not defined. The mechanical and physical property requirements and ASME design
allowables are defined in ASME Code Case N-728.'
Experimental
Specimens
The A978 specimens were refinished from coupons previously used for YMP corrosion
studies by Lawrence Livermore National Laboratory (LLNL) (Heats E084295 and N156129).'
These specimens were used for long-term immersion tests and were not designed for
electrochemical testing. The size of the furnished specimens did not allow fabrication of the
crevice specimens used for the other alloys. The 304B4 and Ni-Cr-Mo-Gd (also known as C4-
Gd) alloys were plate stock. Table 1 shows the composition of these alloys.
7 ASME Boiler and Pressure Vessel Code, Section III, Division 3, "Containment Systems and Transport Packagings
for Spent Nuclear Fuel and High-Level Radioactive Waste," The American Society of Mechanical Engineers, New
York, NY, 2002. Case N-728, Use of B-932-04 plate material for non-pressure retaining spent-fuel containment
internals to 650F (343C), Section III, Division 3, May 10, 2005
8 D.V. Fix, J.C. Estill, L.L. Wong, and R.B. Rebak, "General and Localized Corrosion of Austenitic and Borated
Stainless Steels in Simulated Concentrated Ground Waters," American Society of Mechanical Engineers Pressure
Vessels and Piping Division (ASME-PVP) Conference, San Diego, CA. July 20044
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Lister, Tedd; Mizia, Ron; Birk, Sandra; Matteson, Brent & Tian, Hongbo. Electrochemical Corrosion Testing of Neutron Absorber Materials, report, October 1, 2006; [Idaho Falls, Idaho]. (https://digital.library.unt.edu/ark:/67531/metadc880014/m1/5/: accessed April 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.