Light-driven extracellular electron transfer accelerates microbiologically influenced corrosion by Rhodopseudomonas palustris TIE-1
Yuntian Lou (University of Science and Technology Beijing)
Hao Zhang (University of Science and Technology Beijing)
Ziyu Li (TU Delft - Team Arjan Mol)
Shaopeng Liu (University of Science and Technology Beijing)
Weiwei Chang (University of Science and Technology Beijing)
Hongchang Qian (University of Science and Technology Beijing)
Xiangping Hao (University of Science and Technology Beijing)
Dawei Zhang (University of Science and Technology Beijing)
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Abstract
This study investigates the microbiologically influenced corrosion (MIC) of X80 steel accelerated by the phototrophic bacterium Rhodopseudomonas palustris TIE-1. The photorespiration plays a key role in promoting extracellular electron transfer (EET)-induced MIC. In the early corrosion stage, unstable localized corrosion dominated in the dark, while intense diffusion-controlled corrosion occurs in light. Compared to the sterile anaerobic medium, R. palustris TIE-1 accelerated corrosion of X80 steel, with a significantly higher corrosion rate under light conditions, approximately three times that of dark conditions. Inhibition of photosynthetic electron transfer or cessation of photostimulation resulted in pronounced reduction in the corrosion rate.