Rajala Pauliina, Bomberg Malin, Vepsäläinen Mikko, Carpén Leena
a Materials Performance , Technical Research Centre of Finland (VTT) , Espoo , Finland.
b Material Processing and Geotechnology , Technical Research Centre of Finland (VTT) , Espoo , Finland.
Biofouling. 2017 Feb;33(2):195-209. doi: 10.1080/08927014.2017.1285914. Epub 2017 Feb 10.
Understanding the corrosion of carbon steel materials of low and intermediate level radioactive waste under repository conditions is crucial to ensure the safe storage of radioactive contaminated materials. The waste will be in contact with the concrete of repository silos and storage containers, and eventually with groundwater. In this study, the corrosion of carbon steel under repository conditions as well as the microbial community forming biofilm on the carbon steel samples, consisting of bacteria, archaea, and fungi, was studied over a period of three years in a groundwater environment with and without inserted concrete. The number of biofilm forming bacteria and archaea was 1,000-fold lower, with corrosion rates 620-times lower in the presence of concrete compared to the natural groundwater environment. However, localized corrosion was detected in the concrete-groundwater environment indicating the presence of local microenvironments where the conditions for pitting corrosion were favorable.
了解中低水平放射性废物在储存库条件下碳钢材料的腐蚀情况对于确保放射性污染材料的安全储存至关重要。这些废物将与储存库竖井和储存容器的混凝土接触，并最终与地下水接触。在本研究中，在有和没有插入混凝土的地下水环境中，对碳钢在储存库条件下的腐蚀以及在碳钢样品上形成生物膜的微生物群落（由细菌、古菌和真菌组成）进行了为期三年的研究。与天然地下水环境相比，在有混凝土存在的情况下，形成生物膜的细菌和古菌数量低1000倍，腐蚀速率低620倍。然而，在混凝土 - 地下水环境中检测到了局部腐蚀，这表明存在点蚀条件有利的局部微环境。
