Acceleration of corrosion of 304 stainless steel by outward extracellular electron transfer of Pseudomonas aeruginosa biofilm

The influence of outward extracellular electron transfer (EET) of Pseudomonas aeruginosa in accelerating corro-sion 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 bio-reductive 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.

Automated summary

This study investigated the influence of Pseudomonas aeruginosa's outward extracellular electron transfer (EET) on the accelerated corrosion of 304 stainless steel. The biofilm of P. aeruginosa accelerated pitting corrosion when there was less NO3- available as an electron acceptor. The results from ICP-MS and XPS showed that P. aeruginosa promoted the bio-reductive dissolution of iron oxides in the passive film of stainless steel. Using in situ scanning electrochemical microscopy, a relationship was established between the accelerated deterioration of the passive film and the EET process mediated by the conversion of the redox states of pyocyanin secreted by P. aeruginosa.