Key Laboratory of Marine Environmental Corrosionand Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
Key Laboratory of Marine Environmental Corrosionand Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Total Environ. 2021 Sep 20;788:147573. doi: 10.1016/j.scitotenv.2021.147573. Epub 2021 May 23.
In microbiologically influenced corrosion (MIC) induced by sulfate-reducing bacteria (SRB), the electrons released from iron were transferred via extracellular electron transfer (EET) to the inner cells. Electron mediators and carbon starvation have also been found to promote steel corrosion. This study aimed to investigate the synergistic effects of electron mediators and carbon starvation on MIC and their effect on biofilm catalytic activity. The results demonstrated that the weight losses of X70 steel were 0.68 and 1.03 mg/cm in 100% and 10% carbon source (CS) SRB solution, respectively. The addition of riboflavin and cytochrome c increased the corrosion rate by 1.76 and 1.87 times, respectively, in the 100% CS SRB medium compared to the medium without exogenous redox mediators. For the 10% CS SRB medium, the corrosion rate increased by 1.40 and 1.89 times, respectively, when riboflavin and cytochrome c were added. The addition of riboflavin and cytochrome c also enhanced the biocatalytic activity of the SRB biofilm in both the 100% and 10% CS SRB media.
在硫酸盐还原菌（SRB）引起的微生物影响腐蚀（MIC）中，从铁中释放的电子通过细胞外电子转移（EET）传递到内部细胞。电子媒介物和碳饥饿也被发现可以促进钢的腐蚀。本研究旨在探讨电子媒介物和碳饥饿对 MIC 的协同作用及其对生物膜催化活性的影响。结果表明，在 100%和 10%碳源（CS）硫酸盐还原菌溶液中，X70 钢的失重分别为 0.68 和 1.03mg/cm。与不含外源氧化还原介体的培养基相比，在 100% CS 硫酸盐还原菌培养基中加入核黄素和细胞色素 c 分别使腐蚀速率增加了 1.76 和 1.87 倍。对于 10% CS 硫酸盐还原菌培养基，当加入核黄素和细胞色素 c 时，腐蚀速率分别增加了 1.40 和 1.89 倍。核黄素和细胞色素 c 的添加也增强了 100%和 10% CS 硫酸盐还原菌培养基中硫酸盐还原菌生物膜的生物催化活性。
