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Stress corrosion cracking of copper in swollen bentonite simulating nuclear waste disposal environment
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-10-21 , DOI: 10.1002/maco.202011878 Shinji Fujimoto 1 , Hiroaki Tsuchiya 1 , Soma Ogawa 1 , Yoshihisa Iida 2 , Naoki Taniguchi 3
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-10-21 , DOI: 10.1002/maco.202011878 Shinji Fujimoto 1 , Hiroaki Tsuchiya 1 , Soma Ogawa 1 , Yoshihisa Iida 2 , Naoki Taniguchi 3
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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.
中文翻译：
模拟核废料处置环境的膨润土中铜的应力腐蚀开裂
使用慢应变速率测试（SSRT）检查了膨润土中纯铜的应力腐蚀开裂（SCC）。膨润土用纯净水或NH 3为5和10 mM的水溶液溶胀。SSRT之后，铜表面上形成了厚厚的腐蚀膜和颗粒沉积物。典型的锈蚀破裂型SCC发生在有和没有NH 3的膨润土中的纯铜上。NH 3提高了裂纹扩展速率。可以肯定的是，在塑性变形过程中，铜上形成了一层厚氧化层，从而导致锈蚀裂纹型SCC消失。由于Cu 2+的快速溶解，形成了许多在表面观察到的颗粒沉积物 离子会在局部变形部位形成多孔CuO，而与SCC的发生无关。
更新日期：2020-10-21
中文翻译：
模拟核废料处置环境的膨润土中铜的应力腐蚀开裂
使用慢应变速率测试（SSRT）检查了膨润土中纯铜的应力腐蚀开裂（SCC）。膨润土用纯净水或NH 3为5和10 mM的水溶液溶胀。SSRT之后，铜表面上形成了厚厚的腐蚀膜和颗粒沉积物。典型的锈蚀破裂型SCC发生在有和没有NH 3的膨润土中的纯铜上。NH 3提高了裂纹扩展速率。可以肯定的是，在塑性变形过程中，铜上形成了一层厚氧化层，从而导致锈蚀裂纹型SCC消失。由于Cu 2+的快速溶解，形成了许多在表面观察到的颗粒沉积物 离子会在局部变形部位形成多孔CuO，而与SCC的发生无关。
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