Electrochemical behavior of carbon steel with bentonite/sand in saline environment,Materials and Corrosion

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Electrochemical behavior of carbon steel with bentonite/sand in saline environment
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-09-07 , DOI: 10.1002/maco.202011689
Ayami Kitayama ₁ , Naoki Taniguchi ₁ , Seiichiro Mitsui ₁

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Current designs for the geological disposal of high‐level radioactive waste in Japan use carbon steel overpack containers surrounded by a mixed bentonite/sand buffer material, which will be located in a purpose‐built repository deep underground. Though there are many suitable sites for a repository in Japan, the coastal areas are preferable from a logistical point of view. It is, therefore, important to evaluate the long‐term performance of the carbon steel overpack and the mixed bentonite/sand buffer material in the saline groundwaters of coastal areas. In the current study, the passivation behavior and initial corrosion rates of carbon steel with and without mixed bentonite/sand were tested as a function of the pH and salt concentration in representative saline groundwaters. The main findings indicate that the passivation of carbon steel encapsulated in a buffer material will be unlikely in a saline environment, even at high pH (12), and that the corrosion rate of carbon steel is more strongly affected by the presence of the buffer material than by the salt concentration.

中文翻译：

碳钢与膨润土/砂在盐环境中的电化学行为

日本目前对高放射性废物进行地质处置的设计使用的是碳钢外包装容器，该容器由膨润土/砂混合缓冲材料包围，这些容器将放置在地下专门建造的储存库中。尽管在日本有许多合适的存储库站点，但从后勤角度来看，沿海地区是更可取的。因此，重要的是评估沿海地区盐渍地下水中碳钢外包装和膨润土/砂混合缓冲材料的长期性能。在当前的研究中，测试了含或不含混合膨润土/砂的碳钢的钝化行为和初始腐蚀速率，作为代表性盐渍地下水中pH和盐浓度的函数。

更新日期：2020-09-07

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