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http://dx.doi.org/10.3740/MRSK.2022.32.3.168

Effect of Bacteria in Soil on Microbiologically Influenced Corrosion Behavior of Underground X65 Pipeline  

Choe, Byung Hak (Dept. of Metal and Materials Engineering, Gangneung-Wonju National Univ.)
Han, Sung Hee (Dept. of Metal and Materials Engineering, Gangneung-Wonju National Univ.)
Kim, Dae Hyun (Dept. of Metal and Materials Engineering, Gangneung-Wonju National Univ.)
Kim, Woosik (KOGAS Research Institute (R&D Division Korea Gas Corporation))
Kim, Cheolman (KOGAS Research Institute (R&D Division Korea Gas Corporation))
Choi, Kwang Su (Forensic Safety Division, National Forensic Service)
Publication Information
Korean Journal of Materials Research / v.32, no.3, 2022 , pp. 168-179 More about this Journal
Abstract
Microbiologically Influenced Corrosion (MIC) occurring in underground buried pipes of API 5L X65 steel was investigated. MIC is a corrosion phenomenon caused by microorganisms in soil; it affects steel materials in wet atmosphere. The microstructure and mechanical properties resulting from MIC were analyzed by OM, SEM/EDS, and mapping. Corrosion of pipe cross section was composed of ① surface film, ② iron oxide, and ③ surface/internal microbial corrosive by-product similar to surface corrosion pattern. The surface film is an area where concentrations of C/O components are on average 65 %/16 %; the main components of Fe Oxide were measured and found to be 48Fe-42O. The MIC area is divided into surface and inner areas, where high concentrations of N of 6 %/5 % are detected, respectively, in addition to the C/O component. The high concentration of C/O components observed on pipe surfaces and cross sections is considered to be MIC due to the various bacteria present. It is assumed that this is related to the heat-shrinkable sheet, which is a corrosion-resistant coating layer that becomes the MIC by-product component. The MIC generated on the pipe surface and cross section is inferred to have a high concentration of N components. High concentrations of N components occur frequently on surface and inner regions; these regions were investigated and Na/Mg/Ca basic substances were found to have accumulated as well. Therefore, it is presumed that the corrosion of buried pipes is due to the MIC of the NRB (nitrate reducing bacteria) reaction in the soil.
Keywords
microbiologically influenced corrosion; soil bacteria; underground pipeline; high concentration C/O/N; nitrate reducing bacteria;
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