Abstract
The results show that compared with Escherichia coli promoting corrosion and Pseudomonas fluorescens inhibiting corrosion, in mixed bacteria, the average corrosion rate of carbon steel is reduced by 25.66%. Corrosion current density (Icorr) decreases and the diameter of Nyquist plots increases with time. Meanwhile, the dominant bacteria in mixed condition is verified with different phases. Extracellular polymeric substances (EPS) of E. coli promote the growth of P. fluorescens, and EPS of P. fluorescens can inhibit the growth of E. coli at 400 mg L−1. Scanning electron microscope (SEM) and X-ray diffraction (XRD) demonstrate that the transformation of corrosion products makes the biofilm-corrosion products film formed on the surface of carbon steel more compact in mixed bacteria.
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