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Report No.
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Stress corrosion cracking of copper in swollen bentonite simulating nuclear waste disposal environment

Fujimoto, Shinji*; Tsuchiya, Hiroaki*; Ogawa, Soma*; Iida, Yoshihisa ; Taniguchi, Naoki 

The stress corrosion cracking (SCC) of pure copper in bentonite was examined by a slow strain rate test (SSRT). The bentonite was swollen with pure water or aqueous solutions containing NH$$_{3}$$ of 0.05 M and 0.1 M. The thick corrosion films and particulate deposits were formed on copper surface after SSRT. Typical tarnish rupture type SCC occurred on pure copper in swollen bentonite with and without NH$$_{3}$$. Crack propagation rate was enhanced by NH$$_{3}$$. It is confirmed thick oxide layer is formed on copper during plastic deformation which resulting in the tarnish crack type SCC. The many particulate deposits observed on the surface might be formed as a results of rapid dissolution of Cu$$^{2+}$$ to form porous CuO at locallized deformed sites.

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Category:Materials Science, Multidisciplinary

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