Stress corrosion cracking of copper in swollen bentonite simulating nuclear waste disposal environment |
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| Authors: | Shinji Fujimoto Hiroaki Tsuchiya Soma Ogawa Yoshihisa Iida Naoki Taniguchi |
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| Affiliation: | 1. Division of Materials and Manufacturing Science, Osaka University, Osaka, Japan;2. Nuclear Safety Research Center, Japan Atomic Energy Agency, Ibaraki, Japan;3. Nuclear Backend Technology Center, Japan Atomic Energy Agency, Ibaraki, Japan |
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| Abstract: | Stress corrosion cracking (SCC) of pure copper in bentonite clay was examined using a slow strain rate test (SSRT). Bentonite was swollen with pure water or aqueous solutions containing NH3 of 5 and 10 mM. Thick corrosion films and particulate deposits were formed on the copper surface after the SSRT. Typical tarnish rupture-type SCC occurred on pure copper in swollen bentonite with and without NH3. The crack propagation rate was enhanced by NH3. It is confirmed that a thick oxide layer was formed on copper during plastic deformation, resulting in tarnish crack-type SCC. Many particulate deposits observed on the surface were formed due to the rapid dissolution of Cu2+ ions to form porous CuO at local deformed sites, regardless of the SCC occurrence. |
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| Keywords: | NH3 SCC spent nuclear fuel waste tarnish rupture |
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