Accelerated corrosion of 2205 duplex stainless steel caused by marine aerobic Pseudomonas aeruginosa biofilm

Microbiologically influenced corrosion (MIC) of 2205 duplex stainless steel (DSS) in the presence of Pseudomonas aeruginosa was investigated through electrochemical and surface analyses. The electrochemical results showed that P. aeruginosa significantly reduced the corrosion resistance of 2205 DSS. Confocal laser scanning microscopy (CLSM) images showed that the depths of the largest pits on 2205 DSS with and without P. aeruginosa were 14.0 and 4.9μm, respectively, indicating that the pitting corrosion was accelerated by P. aeruginosa. X-ray photoelectron spectroscopy (XPS) results revealed that CrO3 and CrN formed on the 2205 DSS surface in the presence of P. aeruginosa. •LPR and EIS showed that P. aeruginosa reduced the corrosion resistance of 2205 DSS.•The largest pit depth on 2205 DSS was 4.9μm after 14days incubation in sterile medium.•The largest pit depth on 2205 DSS was 14μm after 14days incubation with P. aeruginosa.•The accelerated pitting was due to the formation of CrO3 and CrN by P. aeruginosa.