Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Bioelectrochemistry. 2022 Feb;143:107951. doi: 10.1016/j.bioelechem.2021.107951. Epub 2021 Sep 20.
Microbiologically influenced corrosion (MIC) is a complex process involving the cooperative effect of different bacterial species that coexist in the biofilm. Early studies focused on the MIC of single bacterial communities. However, in natural and industrial fields, biofilms are mostly composed of a variety of species. In this work, the effect of interspecific interaction on corrosion of X65 steel was investigated through the mixed culture of sulfate reducing bacteria (SRB) and iron oxidizing bacteria (IOB). Results demonstrated that the mixed microbial consortia created a cooperative effect to aggravate the local corrosion of X65 steel. Compared with the single species, the presence of IOB increased the growth activity of SRB cells and promoted the role of SRB in steel corrosion. The corrosion form on the surface of X65 steel gradually changed to annular pits induced by anaerobic SRB. The succession of dominant bacteria and the development of mixed species biofilm led to an increase in corrosion rate and local corrosion. The corrosion mechanism of X65 steel by mixed species biofilm at different stages was carefully elucidated.
微生物影响腐蚀（MIC）是一个复杂的过程，涉及到在生物膜中共存的不同细菌种的协同作用。早期的研究集中在单一细菌群落的 MIC 上。然而，在自然和工业领域，生物膜大多由多种物种组成。在这项工作中，通过硫酸盐还原菌（SRB）和铁氧化菌（IOB）的混合培养，研究了种间相互作用对 X65 钢腐蚀的影响。结果表明，混合微生物群落产生了协同作用，加剧了 X65 钢的局部腐蚀。与单一物种相比，IOB 的存在增加了 SRB 细胞的生长活性，并促进了 SRB 在钢腐蚀中的作用。X65 钢表面的腐蚀形式逐渐变为厌氧 SRB 引起的环形蚀坑。优势菌的演替和混合种生物膜的发展导致腐蚀速率和局部腐蚀的增加。详细阐明了混合种生物膜在不同阶段对 X65 钢的腐蚀机制。
