|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Frontiers of Materials Award Symposium: Microbiologically Influenced Corrosion - How Organisms Accelerate Materials Degradation
||Corrosion of Stainless Steel in Deep Groundwater - Microbial and Geochemical Processes
||Pauliina Rajala, Elisa Isotahdon
|On-Site Speaker (Planned)
Corrosion of two stainless steel grades, AISI304 and AIS316, was studied in long-term in-situ and laboratory experiments in conditions relevant for underground geological repository for nuclear waste. Low and intermediate level nuclear waste is produced during the operation and decommissioning of nuclear power plants. The metallic portion of this waste includes various parts made of stainless steels and carbon steel. At Olkiluoto nuclear power plant (Finland) the waste has been disposed of in a geological repository located at the depth of 60-95m below surface.
General corrosion rates were moderate but localized corrosion was frequently detected. Interestingly, higher alloyed grade (AISI316) faced more intensive corrosion than lower alloyed grade in both laboratory and in-situ field conditions. Localized corrosion was pitting and intergranular corrosion. Diverse microbial community was detected on surfaces of steels in both in-situ and laboratory conditions. The microbes were accumulated on grain boundaries, where more intensive corrosion was detected.
||Iron and Steel, Environmental Effects, Other