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. 2021 Feb 19;6(8):5653-5660.
doi: 10.1021/acsomega.0c06103. eCollection 2021 Mar 2.

Imidazoline Gemini Surfactants as Corrosion Inhibitors for Carbon Steel X70 in NaCl Solution

Wenchang Zhuang  1 , Xiqiu Wang  1   2 , Wenyou Zhu  1 , Yukun Zhang  2 , Dan Sun  1 , Rui Zhang  1 , Chunyan Wu  1
Affiliations

Imidazoline Gemini Surfactants as Corrosion Inhibitors for Carbon Steel X70 in NaCl Solution

Wenchang Zhuang et al. ACS Omega. .

Abstract

The Gemini imidazoline surfactants were synthesized from a series of saturated fatty acids. Electrochemical impedance spectroscopy (EIS), polarization curve, and quantum chemistry methods were used to study the corrosion inhibition behavior of Gemini imidazoline surfactants for X70 carbon steel in NaCl solution. Results reveal that such kind of surfactants has an outstanding inhibition effect on carbon steel X70 in NaCl solution and that the restrained efficiency of Gemini imidazoline in an alkaline solution is better than that in a neutral solution. The shorter the carbon chain length, the higher the suppressive efficiency. The higher the concentration of Gemini imidazoline surfactant, the better the inhibition effect.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Synthesis route of GIS.
Figure 2
Figure 2
FT-IR spectra of the GIS.
Figure 3
Figure 3
1H NMR spectra of the GIS.
Figure 4
Figure 4
Polarization and impedance curves of GIS with different carbon chain lengths for pH = 5, 7, 9.
Figure 5
Figure 5
Polarization and impedance curves for LG systems.
Figure 6
Figure 6
Electron distribution in the HOMO and LUMO for LG.
See this image and copyright information in PMC

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