期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 -, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1007/s11665-023-08801-9
关键词
biofilm; iron oxidizing bacteria; microbial corrosion; pipeline steel; sulfate reducing bacteria
The microbial corrosion of X60 pipeline steel in a groundwater environment containing mixed colonies of sulfate-reducing bacteria (SRB) and iron-oxidizing bacteria (IOB) was investigated. The results show that both SRB and IOB significantly affect the electrochemical process of steel and have a synergistic effect on intensifying microbial proliferation and promoting corrosion.
Microbial corrosion of X60 pipeline steel was examined by polarization scan, electrochemical impedance spectroscopy, scanning electron microscopy, x-ray diffractometry, and energy dispersive spectroscopy during and after immersion in a groundwater environment containing mixed colonies of anaerobic sulfate-reducing bacteria (SRB) and aerobic iron-oxidizing bacteria (IOB). The results show that individual SRB and IOB affected the electrochemical process of steel, and they also have a significant synergistic effect on intensifying microbial proliferation and promoting corrosion. IOB improved the metabolic activities of SRB by O2 consumption and biofilm formation, thus creating a suitable anaerobic environment for SRB and promoting localized corrosion. The corrosion process of the steel in SRB/IOB mixed culture was influenced comprehensively by dissolved oxygen, steel/biofilm interactions, metabolic activities, and by-products.
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