The effect of riboflavin on the microbiologically influenced corrosion of X80 Pipeline Steel by Escherichia Coli

Endogenous electron shuttling riboflavin (RF) was used as a carrier to investigate the Escherichia coli (E. coli) corrosion effect in X80 pipeline steel by cyclic voltammetry (CV), corrosion weight loss, electrochemical testing, scanning electron microscopy (SEM), energy spectrum analysis (EDS) and diffraction of x-rays (XRD) analysis. The CV results showed that the E. coli bacterium and its metabolites did not exhibit electroactivity. After adding RF, the redox peak appeared in the system, indicating that E. coli can use RF for extracellular electron transfer. The corrosion weight loss rate showed that the corrosion rate of X80 pipeline steel of the E. coli + 20 ppm RF system is about twice that of the E. coli system. XRD test results showed that RF did not change the corrosion pathway of E. coli and only affected the corrosion process of E. coli. Electrochemical tests showed that the corrosion current density of the E. coli + 20 ppm RF system was 1.5 times that of the E. coli system. Therefore, E. coli accelerates the corrosion of X80 pipeline steel through RF for extracellular electron transfer.