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Synthesis of Environmentally Friendly Proline Mannich Quaternary Ammonium Salt and Its Acidification Corrosion Inhibition Performance

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Abstract:

A novel Mannich-based quaternary ammonium salt (PMQ) corrosion inhibitor was synthesized via Mannich reaction followed by quaternization. Its corrosion inhibition performance for N80 steel in 15 wt% HCl at 303 K was evaluated using electrochemical methods. The addition of 1 wt% PMQ achieved an inhibition efficiency of 98.6%. The adsorption of PMQ onto the metal surface followed a mixed physisorption–chemisorption mechanism. Characterization by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), contact angle measurements, molecular dynamics simulations, and quantum chemical calculations demonstrated that PMQ forms a hydrophobic film through electrostatic adsorption via its quaternary ammonium group and π-electron conjugation from the proline ring. This film effectively blocks the penetration of H⁺ and Cl⁻ ions, forming a dense protective layer that suppresses the diffusion of corrosive species and mitigates acid-induced corrosion.

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Periodical:

Advances in Science and Technology (Volume 180)

Pages:

45-51

DOI:

https://doi.org/10.4028/p-L3rMwI

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Online since:

July 2026

Authors:

Rui Yv Bai*, Wei An Huang, Wei Dong Wang, Yi Zhuo Ge

Keywords:

Corrosion Inhibitor, N80 Steel, Oilfield Acidification, Proline, Theoretical Calculation

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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