Abstract
The process of microbiologically influenced corrosion (MIC) in soils has received widespread attention. Herein, long-term outdoor soil burial experiments were conducted to elucidate the community composition and functional interaction of soil microorganisms associated with metal corrosion. The results indicated that iron-oxidizing (e.g., Gallionella), nitrifying (e.g., Nitrospira), and denitrifying (e.g., Hydrogenophaga) microorganisms were significantly enriched in response to metal corrosion and were positively correlated with the metal mass loss. Corrosion process may promote the preferential growth of the abundant microbes. The functional annotation revealed that the metabolic processes of nitrogen cycling and electron transfer pathways were strengthened, and also that the corrosion of metals in soil was closely associated with the biogeochemical cycling of iron and nitrogen elements and extracellular electron transfer. Niche disturbance of microbial communities induced by the buried metals facilitated the synergetic effect of the major MIC participants. The co-occurrence network analysis suggested possible niche correlations among corrosion related bioindicators.
Highlights
Engineering materials that are partially or completely buried in the soil are widely used in different industrial facilities[1,2]
Xray diffraction (XRD) analysis revealed that the corrosion products formed on the surfaces of Q235 and X80Cu had similar compositions and Fe2O3 was identified as the major crystalline phase component (Fig. 1f)
To identify the representative taxa that responded positively to metal corrosion, we focused on microorganisms at the class level (Fig. 4d) and at the genus level that had a significantly higher abundance in samples collected at 2 cm from the metal surface compared to those collected at 10 cm horizontal distance (Fig. 5)
Summary
Engineering materials that are partially or completely buried in the soil are widely used in different industrial facilities[1,2]. The serviceability of these infrastructures is significantly affected by soil corrosion. The process is commonly known as microbiologically influenced corrosion (MIC) or biocorrosion. The mechanism underlying the participation of these microorganisms in corrosion is often closely related to the elemental cycle of the environment[6,7] and the abundance of microorganisms in biofilms formed on corroded metals[8]. The known IOB Gallionella and Sideroxydans were observed to be early colonizers on steel surface in a coastal marine environment and became the dominant species in the corresponding MIC community[10]
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