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51317--9709-Atmospheric Microbiologically Influenced Corrosion

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A combination of carbon and stainless steel probes and coupons was used to evaluate microbiologically influenced corrosion (MIC) in humid air and determine whether dry storage systems (DSSs) could be affected by MIC during extended storage.

 

Product Number: 51317--9709-SG
ISBN: 9709 2017 CP
Author: Xihua He
Publication Date: 2017
Industry: Corrosion Monitoring and Control
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$20.00

In the United States a large fraction of spent nuclear fuel is stored in dry cask storage systems (DCSS). Most DCSS designs use canisters fabricated with austenitic stainless steel. The canisters are placed either horizontally or vertically inside a metal or concrete shielding structure with vents to allow airflow for cooling. Canisters may be exposed to airborne species that enter through the vents and deposit on the surface. Brine could then form by the process of deliquescence in high-humidity conditions and support microbial activity. Microbiologically influenced corrosion (MIC) is a process by which numerous types of microbes ranging from iron-oxidizing iron-reducing sulfate-reducing acid-producing and exopolymer-producing bacteria deteriorate metals through their metabolic activities. Some types of MIC are dependent on the physical interaction between the metal surface and a microbial biofilm where oxygen is depleted on the metal surface facilitating anaerobic metabolisms by bacteria such as sulfate-reducing bacteria (SRB).It has been reported that biofilms can form even under radiation at elevated temperatures up to 110 °C. However most of the available data on MIC are for metallic components when the metal surface is continuously wet. Data on MIC under atmospheric conditions where the metal surface could experience wet and dry cycles due to diurnal and seasonal humidity variations are sparse and conflicting.The paper will present the results onevaluating MIC under atmospheric conditions especially under dry and wet cycles.

Key words: Microbiologically influenced corrosion, humid air, carbon steel, stainless steel

In the United States a large fraction of spent nuclear fuel is stored in dry cask storage systems (DCSS). Most DCSS designs use canisters fabricated with austenitic stainless steel. The canisters are placed either horizontally or vertically inside a metal or concrete shielding structure with vents to allow airflow for cooling. Canisters may be exposed to airborne species that enter through the vents and deposit on the surface. Brine could then form by the process of deliquescence in high-humidity conditions and support microbial activity. Microbiologically influenced corrosion (MIC) is a process by which numerous types of microbes ranging from iron-oxidizing iron-reducing sulfate-reducing acid-producing and exopolymer-producing bacteria deteriorate metals through their metabolic activities. Some types of MIC are dependent on the physical interaction between the metal surface and a microbial biofilm where oxygen is depleted on the metal surface facilitating anaerobic metabolisms by bacteria such as sulfate-reducing bacteria (SRB).It has been reported that biofilms can form even under radiation at elevated temperatures up to 110 °C. However most of the available data on MIC are for metallic components when the metal surface is continuously wet. Data on MIC under atmospheric conditions where the metal surface could experience wet and dry cycles due to diurnal and seasonal humidity variations are sparse and conflicting.The paper will present the results onevaluating MIC under atmospheric conditions especially under dry and wet cycles.

Key words: Microbiologically influenced corrosion, humid air, carbon steel, stainless steel

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