EET (extracellular electron transfer) is behind MIC (microbiologically influenced corrosion) of carbon steel by SRB (sulfate reducing bacteria). This work evaluated 20 ppm (w/w) riboflavin (an electron mediator) acceleration of C1018 carbon steel MIC by Desulfovibrio ferrophilus IS5 in enriched artificial seawater (EASW) after 7-d incubation in anaerobic vials at 28 °C. Twenty ppm riboflavin did not significantly change cell growth or alter the corrosion product varieties, but it led to 52% increase in weight loss and 105% increase in pit depth, compared to the control without 20 ppm riboflavin. With 20 ppm riboflavin supplement in EASW, D. ferrophilus yielded weight loss-based corrosion rate of 1.57 mm/y (61.8 mpy), and pit depth growth rate of 2.88 mm/y (113 mpy), highest reported for short-term pure-strain SRB MIC of carbon steel. Electrochemical tests in 450 mL glass cells indicated that the biofilm responded rather quickly to the riboflavin injection (20 ppm in broth) to the culture medium. Polarization resistance (R_p) began to decrease within minutes after injection. Within 2 h, the riboflavin injection led to 31% decrease in R_p and 35% decrease in R_ct + R_f from electrochemical impedance spectroscopy (EIS). The Tafel corrosion current density increased 63% 2 h after the injection.

EET（细胞外电子转移）落后于 SRB（硫酸盐还原细菌）对碳钢的 MIC（微生物影响腐蚀）。这项工作评估了 20 ppm (w/w) 核黄素（一种电子介体）在 28 °C 下在厌氧瓶中孵育 7 天后，嗜铁脱硫弧菌IS5 在富集的人造海水 (EASW) 中对 C1018 碳钢 MIC 的加速。与不含 20 ppm 核黄素的对照相比，20 ppm 核黄素没有显着改变细胞生长或改变腐蚀产物的种类，但它导致重量损失增加 52%，凹坑深度增加 105%。在 EASW 中添加 20 ppm 的核黄素补充剂，D. ferrophilus产生基于重量损失的腐蚀速率为 1.57 mm/y (61.8 mpy)，凹坑深度增长率为 2.88 mm/y (113 mpy)，这是碳钢短期纯应变 SRB MIC 报告的最高值。在 450 mL 玻璃细胞中进行的电化学测试表明，生物膜对核黄素注射液（肉汤中 20 ppm）对培养基的反应相当快。极化电阻 ( R _p ) 在注射后几分钟内开始下降。在 2 小时内，核黄素注射导致电化学阻抗谱 (EIS)的R _{p下降 31% 和}R _ct  +  R _f下降 35% 。注入后 2 小时，塔菲尔腐蚀电流密度增加了 63%。