Microbial diversity and corrosion behaviour of carbon steel and stainless steel after one-year exposure in alkaline ground water

Leena Carpen, Pauliina Rajala, Mikko Vepsäläinen, Malin Bomberg, Mari Raulio

Research output: Contribution to conferenceConference articleScientificpeer-review

Abstract

Contaminated low- and intermediate level waste is produced during the operation and decommissioning of nuclear power plants. This waste contains pipes, valves, filters, insulators etc. The metallic waste is mostly composed of carbon and stainless steel. In Finland this metallic waste is planned to be disposed in concrete boxes into bedrock silos. The effects of microbiological activity on the corrosion of decommissioning waste are still unclear and needs to be studied further. A series of semi-field exposure studies was started in October 2011 at the disposal site. Preliminary results of the first year´s on site studies are discussed in this paper. These results show that alkaline environment caused by concrete addition clearly decelerates the microbial growth and biofilm formation as well as the corrosion. Corrosion rate of carbon steel was very low after the first year of disposal simulation study. Corrosion of stainless steel was not detected at all. According to these preliminary results, concrete can be considered to inhibit microbially induced corrosion in disposal systems at least at the early stages of disposal time. The results of this study can be used when evaluating risks of the microbially induced corrosion of metallic materials in the underground repository.
Original languageEnglish
PagesNACE-2014-4035
Number of pages12
Publication statusPublished - 2014
EventCorrosion 2014 - San Antonio, United States
Duration: 9 Mar 201413 Mar 2014

Conference

ConferenceCorrosion 2014
CountryUnited States
CitySan Antonio
Period9/03/1413/03/14

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corrosion
steel
groundwater
carbon
decommissioning
alkaline environment
nuclear power plant
repository
biofilm
exposure
bedrock
pipe
filter
simulation

Cite this

Carpen, L., Rajala, P., Vepsäläinen, M., Bomberg, M., & Raulio, M. (2014). Microbial diversity and corrosion behaviour of carbon steel and stainless steel after one-year exposure in alkaline ground water. NACE-2014-4035. Paper presented at Corrosion 2014, San Antonio, United States.
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Carpen, L, Rajala, P, Vepsäläinen, M, Bomberg, M & Raulio, M 2014, 'Microbial diversity and corrosion behaviour of carbon steel and stainless steel after one-year exposure in alkaline ground water' Paper presented at Corrosion 2014, San Antonio, United States, 9/03/14 - 13/03/14, pp. NACE-2014-4035.

Microbial diversity and corrosion behaviour of carbon steel and stainless steel after one-year exposure in alkaline ground water. / Carpen, Leena; Rajala, Pauliina; Vepsäläinen, Mikko; Bomberg, Malin; Raulio, Mari.

2014. NACE-2014-4035 Paper presented at Corrosion 2014, San Antonio, United States.

Research output: Contribution to conferenceConference articleScientificpeer-review

TY - CONF

T1 - Microbial diversity and corrosion behaviour of carbon steel and stainless steel after one-year exposure in alkaline ground water

AU - Carpen, Leena

AU - Rajala, Pauliina

AU - Vepsäläinen, Mikko

AU - Bomberg, Malin

AU - Raulio, Mari

N1 - CA2: BA2164

PY - 2014

Y1 - 2014

N2 - Contaminated low- and intermediate level waste is produced during the operation and decommissioning of nuclear power plants. This waste contains pipes, valves, filters, insulators etc. The metallic waste is mostly composed of carbon and stainless steel. In Finland this metallic waste is planned to be disposed in concrete boxes into bedrock silos. The effects of microbiological activity on the corrosion of decommissioning waste are still unclear and needs to be studied further. A series of semi-field exposure studies was started in October 2011 at the disposal site. Preliminary results of the first year´s on site studies are discussed in this paper. These results show that alkaline environment caused by concrete addition clearly decelerates the microbial growth and biofilm formation as well as the corrosion. Corrosion rate of carbon steel was very low after the first year of disposal simulation study. Corrosion of stainless steel was not detected at all. According to these preliminary results, concrete can be considered to inhibit microbially induced corrosion in disposal systems at least at the early stages of disposal time. The results of this study can be used when evaluating risks of the microbially induced corrosion of metallic materials in the underground repository.

AB - Contaminated low- and intermediate level waste is produced during the operation and decommissioning of nuclear power plants. This waste contains pipes, valves, filters, insulators etc. The metallic waste is mostly composed of carbon and stainless steel. In Finland this metallic waste is planned to be disposed in concrete boxes into bedrock silos. The effects of microbiological activity on the corrosion of decommissioning waste are still unclear and needs to be studied further. A series of semi-field exposure studies was started in October 2011 at the disposal site. Preliminary results of the first year´s on site studies are discussed in this paper. These results show that alkaline environment caused by concrete addition clearly decelerates the microbial growth and biofilm formation as well as the corrosion. Corrosion rate of carbon steel was very low after the first year of disposal simulation study. Corrosion of stainless steel was not detected at all. According to these preliminary results, concrete can be considered to inhibit microbially induced corrosion in disposal systems at least at the early stages of disposal time. The results of this study can be used when evaluating risks of the microbially induced corrosion of metallic materials in the underground repository.

M3 - Conference article

SP - NACE-2014-4035

ER -