Stress corrosion cracking susceptibility of P285NH and API 5L X65 steel grades in the high‐level radioactive waste repository cell concept,Materials and Corrosion

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Stress corrosion cracking susceptibility of P285NH and API 5L X65 steel grades in the high‐level radioactive waste repository cell concept
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-09-28 , DOI: 10.1002/maco.202011842
Nicolas Bulidon ₁ , Valérie Deydier ₂ , Frederic Bumbieler ₂ , Claude Duret‐Thual ₁ , Christophe Mendibide ₁ , Didier Crusset ₂

Affiliation

Since 2014, the concept developed for the disposal of high‐level radioactive waste in the French deep geological repository project Cigéo includes a cement‐based grout material. This cement‐based grout material will be injected between the casing and the claystone to neutralize the potential acidity resulting from the claystone oxidation induced by the drilling process of the disposal cell. In these conditions of pH (around 10.5) and temperature (90°C, maximum expected during the disposal), the metallic materials could be sensitive to stress corrosion cracking (SCC). In this project, different environments (aerated or deaerated, at room temperature or at 90°C) and synthetic solutions are considered to reproduce the different periods expected during the long life repository. The project is based on electrochemical measurements (polarization curves to define the SCC critical domain of potentials), slow strain rate tensile tests, and long‐term immersion for crack initiation and propagation tests.

中文翻译：

高放射性废物处置库单元概念中P285NH和API 5L X65钢牌号的应力腐蚀开裂敏感性

自2014年以来，法国深层地质处置库项目Cigéo中提出的用于处置高放射性废物的概念包括水泥基灌浆材料。这种水泥基灌浆材料将注入套管和粘土之间，以中和处置池钻孔过程中引起的粘土氧化而产生的潜在酸度。在这些pH值（约10.5）和温度（90°C，在处理过程中预期的最高温度）下，金属材料可能对应力腐蚀开裂（SCC）敏感。在该项目中，考虑使用不同的环境（在室温或90°C下通风或脱气）和合成溶液来重现长寿命存储库中预期的不同时期。

更新日期：2020-09-28

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