The Swiss waste management programme foresees that low‐ and intermediate‐level radioactive waste will be disposed of in a deep geological repository constructed in Opalinus Clay. Gas generation is expected in the repository due to the decomposition of organic materials and the corrosion of metals, with carbon steel being the primary source. The corrosion behaviour of mild steel under anoxic conditions has been studied over the course of several years to better understand the long‐term hydrogen evolution profile under anticipated repository conditions. Steel, either bare or encased within mortar, was tested in water vapour or immersed in electrolytes representative of aged cement waters at 50°C. The corrosion rate was measured indirectly through the hydrogen analysis using a solid‐state probe. The hydrogen evolution behaviour of grout was also monitored to more accurately determine the hydrogen generating from the corrosion of the embedded steel. For steel in water vapour or in alkaline environments, embedded in cementitious material or immersed in simulated aged cement pore water, corrosion rates were invariably <1 nm/year after several years of analysis.

中文翻译：

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碳钢在缺氧碱性环境中模拟瑞士L / ILW储存环境的缺氧腐蚀行为

瑞士废物管理计划预计，低级和中级放射性废物将在Opalinus Clay建造的深层地质处置库中处置。由于有机材料的分解和金属的腐蚀，预计在储存库中会产生气体，其中碳钢是主要来源。几年来一直在研究低氧钢在低氧条件下的腐蚀行为，以更好地了解预期的储存条件下氢的长期析出曲线。将裸露或包裹在砂浆中的钢在水蒸气中进行测试，或将其浸入代表50°C的老化水泥水的电解质中。腐蚀速率是使用固态探针通过氢分析间接测量的。还监控了灌浆的氢逸出行为，以更准确地确定由嵌入钢的腐蚀产生的氢。对于钢在水蒸气或碱性环境中，埋入胶结材料中或浸入模拟的老化水泥孔隙水中，经过数年的分析，腐蚀速率始终<1 nm /年。