What question did this study set out to answer?

This research aims to explore the interactions between a surfactant and biocide in corrosion prevention.

April 19, 2026Industrial & Engineering Chemistry Research0 citations

Transition from Antagonistic to Synergistic Interactions between Corrosion Inhibitors and Biocides: Role of Hydrogen Bonding Networks─Experimental and Theoretical Insights

KYKeting YanSouthwest Petroleum University SDShanshan Dai XJXianwu Jing

Key Points

This research aims to explore the interactions between a surfactant and biocide in corrosion prevention.
Investigated CO2/SRB-induced corrosion in shale gas pipelines.
Used a morpholine-based gemini surfactant and gallic acid at varying molar ratios.
Conducted electrochemical measurements to assess corrosion rates and resistance.
Utilized atomic force microscopy (AFM) for surface roughness analysis.
Employed quantum chemical calculations and molecular dynamics (MD) simulations to understand interactions.
Optimal molar ratio of BDHM:GA at 5:1 reduces corrosion rate significantly.
Inhibition efficiency reached 87%, with a major decrease in corrosion current density.
Surface roughness showed a marked reduction as measured by AFM.
XPS indicated that oxygen-containing species predominantly contribute to adsorption.
Antibacterial tests confirmed the surfactant and biocide combination effectively inhibited SRB activity.

Abstract

CO2/SRB-induced corrosion in shale gas pipelines is investigated with an emphasis on the synergistic interaction between a morpholine-based gemini surfactant (BDHM) and gallic acid (GA). At 100 ppm, an optimal BDHM:GA molar ratio of 5:1 reduces the corrosion rate from 0.9858 to 0.1288 mm·a–1, corresponding to an inhibition efficiency of 87%. Electrochemical measurements show nearly 1 order of magnitude decrease in corrosion current density and a 3-fold increase in polarization resistance, indicating enhanced interfacial protection. AFM analysis reveals a reduction in surface roughness, with Sa decreasing from 39.7 to 27.4 nm and Sq improving from 50.9 to 34.9 nm. XPS results indicate that adsorption is dominated by oxygen-containing species. Quantum chemical calculations and molecular dynamics (MD) simulations demonstrate that intermolecular hydrogen bonding between GA and BDHM promotes their coaggregation into stable, high-performance clusters, enhancing adsorption on both steel surfaces and bacterial membranes. Antibacterial experiments confirm the enhanced inhibition of SRB activity.

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