Acceleration of corrosion of 304 stainless steel by outward extracellular electron transfer of Pseudomonas aeruginosa biofilm
By Huang, Luyao; Chang, Weiwei; Zhang, Dawei; Huang, Ye; Li, Ziyu; Lou, Yuntian; Qian, Hongchang; Jiang, Chengying; Li, Xiaogang; Mol, Arjan
Published in Corrosion Science
2022
Abstract
The influence of outward extracellular electron transfer (EET) of Pseudomonas aeruginosa in accelerating corrosion of 304 stainless steel was investigated. With less NO3− available as electron acceptor, P. aeruginosa biofilm accelerated the pitting corrosion. The ICP-MS and XPS results indicated that P. aeruginosa promoted the bioreductive dissolution of iron oxides in the passive film of stainless steel. Using in situ scanning electrochemical microscopy, we established a relationship between this accelerated deterioration of the passive film and the EET process mediated by the conversion of the redox states of pyocyanin secreted by P. aeruginosa.