Extracellular electron transfer corrosion mechanism of two marine structural steels caused by nitrate reducing Halomonas titanicae
Shihang Lu, Wenwen Dou, Tingyue Gu, Shiqiang Chen, Cheng Xin, Ruizhi Hou, Ye Wang, Yuxue Zhang, Guangzhou Liu
Abstract
The extracellular electron transfer (EET) mechanism for corrosion of EH36 steel (with copper) and Q235 steel (without copper) caused by Halomonas titanicae was investigated. Due to copper cytotoxicity, the sessile H. titanicae cells on the EH36 surface was only 18% of that on Q235. This led to its lower EET rate, resulting in EH36 corrosion being 0.67 times of Q235 corrosion. The EET corrosion mechanism was further proven by the increased corrosion of the two steels after injection to the H. titanicae broth of 20 ppm (w/w) (in the broth) riboflavin , an electron mediator known to accelerate EET.
Topics & Concepts
CorrosionHalomonasCopperElectron transferMaterials scienceNitrateMetallurgyChemistryInorganic chemistryPhotochemistryOrganic chemistryBiochemistry16S ribosomal RNAGeneMicrobial Fuel Cells and BioremediationCorrosion Behavior and InhibitionAdvanced oxidation water treatment