AUTHOR=Yang Jike , Zhang Yu , Chang Weiwei , Lou Yuntian , Qian Hongchang 

TITLE=Microbiologically influenced corrosion of FeCoNiCrMn high-entropy alloys by Pseudomonas aeruginosa biofilm

JOURNAL=Frontiers in Microbiology

VOLUME=13

YEAR=2022

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2022.1009310

DOI=10.3389/fmicb.2022.1009310

ISSN=1664-302X

ABSTRACT=<p><italic>Pseudomonas aeruginosa</italic> is widely found in industrial water and seawater. Microbiologically influenced corrosion (MIC) caused by <italic>P. aeruginosa</italic> is a serious threat and damage to the safe service of steel materials. In this study, the MIC behavior of FeCoNiCrMn high-entropy alloy (HEA) by <italic>P. aeruginosa</italic> biofilm was investigated in the simulated marine medium. The maximum pitting depth of the HEA coupons in the <italic>P. aeruginosa</italic>-inoculated medium was ~4.77 μm, which was 1.5 times that in the sterile medium. EIS and potentiodynamic polarization results indicated that <italic>P. aeruginosa</italic> biofilm reduced the corrosion resistance of the passive film of HEA coupons and promoted its anodic dissolution process. XPS and AES results further demonstrated that <italic>P. aeruginosa</italic> interfered with the distribution of elements in the passive film and significantly promoted the dissolution of Fe.</p>