Microbiologically influenced corrosion of FeCoNiCrMn high-entropy alloys by biofilm.

is widely found in industrial water and seawater. Microbiologically influenced corrosion (MIC) caused by 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 biofilm was investigated in the simulated marine medium. The maximum pitting depth of the HEA coupons in the -inoculated medium was ~4.77 μm, which was 1.5 times that in the sterile medium. EIS and potentiodynamic polarization results indicated that 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 interfered with the distribution of elements in the passive film and significantly promoted the dissolution of Fe.