The mechanistic pathways of extracellular polymeric substances in the inhibition of carbon steel corrosion
Year: 2025
Type: article
Abstract: This study examined the corrosion inhibition mechanisms of extracellular polymeric substances (EPS) from Lactobacillus reuteri, Pseudomonas fluorescens, and Escherichia coli on carbon steel. Using UV spectrophotometry, LC-MS, infrared spectroscopy, and atomic force microscopy (AFM), it was apparent that all three EPS effectively inhibited corrosion, with optimal concentrations of 300 mg/L for Lactobacillus reuteri and 400 mg/L for the other species, yielding inhibition efficiencies of 28.25%, 23.87%, and 21.72%, respectively. The carboxyl group content was critical, with Lactobacillus reuteri EPS having the highest proportion. Functional group analysis showed it contained 12.39% and 12.93% more carboxyl groups than those from Pseudomonas fluorescens and Escherichia coli. Iron ion adsorption was primarily physical and occurred in a monolayer, with a greater capacity for Fe³+ than Fe2+, peaking at 600 mg/L.
Source: Figshare
Authors: Xu, Ping, Chen, Xinyue, Xi, Weijin
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6920612627
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