Effect of Halogen Anions on Corrosion Inhibition of Ionic Liquids

doi:10.11902/1005.4537.2021.218

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (5): 791-797 DOI: 10.11902/1005.4537.2021.218

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Effect of Halogen Anions on Corrosion Inhibition of Ionic Liquids

FENG Li¹^,²(

), ZHANG Shengtao³, ZHENG Siyuan¹, HU Zhiyong¹, ZHU Hailin¹, MA Xuemei¹

^1.School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China
^2.Dezhou Graduate School, North University of China, Dezhou 253034, China
^3.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China

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Abstract

The corrosion inhibition performance of imidazolidyl ionic liquids with different halogen anions (such as 1-vinyl-3-butyl-imidazolium chloride salt, [VBIM]Cl, 1-vinyl-3-butylimidazolium bromide, [VBIM]Br, and 1-vinyl-3-butylimidazolium iodide, [VBIM]I) on X70 steel in 0.5 mol/L H₂SO₄ solution was comparatively assessed by electrochemical impedance spectroscopy, polarization curve measurement, scanning electron microscopy and atomic force microscopy. The results indicated that they were all the mixed corrosion inhibitor and could effectively inhibit the corrosion of X70 steel in 0.5 mol/L H₂SO₄ solution. With the increase of the concentration of corrosion inhibitors, the corrosion inhibition efficiency increases gradually. And the inhibition efficiency reached the maximum by the concentration of 5 mmol/L. The corrosion inhibition efficiency of the inhibitors may be ranked as the follows: [VBIM]I is higher than [VBIM]Cl and [VBIM]Br in turn, which is mainly due to the specific adsorption of I^-. The inhibition mechanism may be described as that there is a synergistic inhibition effect between the cation and anion of the studied ionic liquid corrosion inhibitors. In other words, both the anions and cations of ionic liquid can participate in the corrosion inhibition process of metal.

Key words: corrosion inhibitor Ionic liquid sulfuric acid electrochemistry X70 steel morphology analysis

Received: 30 August 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(201878029)

Corresponding Authors: FENG Li E-mail: 20200164@nuc.edu.cn

About author: FENG Li, E-mail: 20200164@nuc.edu.cn

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Cite this article:

FENG Li, ZHANG Shengtao, ZHENG Siyuan, HU Zhiyong, ZHU Hailin, MA Xuemei. Effect of Halogen Anions on Corrosion Inhibition of Ionic Liquids. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 791-797.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.218 OR https://www.jcscp.org/EN/Y2022/V42/I5/791

Fig.1 Chemical structures of imidazole-based ionic liquid inhibitors

Fig.2 Equivalent circuits used to fit impedance data with (a) and without (b) inductive impedance

Fig.3 Nyquist and Bode plots of X70 steel electrode in 0.5 mol/L H₂SO₄ solutions with different concentrations of [VBIM]Cl (a), [VBIM]Br (b) and [VBIM]I (c) at 298 K

Table 1 Electrochemical impedance data of X70 steel electrode in 0.5 mol/L H₂SO₄ solutions containing different concentrations of [VBIM]Cl, [VBIM]Br and [VBIM]I at 298 K

Fig.4 Polarization curves of X70 steel electrode in 0.5 mol/L H₂SO₄ solutions with different concentrations of [VBIM]Cl (a), [VBIM]Br (b) and [VBIM]I (c) at 298 K

Table 2 Polarization curve parameters of X70 steel electrode in 0.5 mol/L H₂SO₄ solutions with different concentrations of [VBIM]Cl, [VBIM]Br and [VBIM]I at 298 K

Fig.5 SEM images of X70 steel electrode immersed for 4 h at 298 K in 0.5 mol/L H₂SO₄ solutions without (a) and with 5 mmol/L [VBIM]Cl (b), [VBIM]Br (c) and [VBIM]I (d)

Fig.6 AFM and corresponding height images of X70 steel electrode immersed for 4 h at 298 K in 0.5 mol/L H₂SO₄ solutions without (a) and with 5 mmol/L [VBIM]Cl (b), [VBIM]Br (c) and [VBIM]I (d)

Fig.7 Schematic diagram of corrosion inhibition mechanism of ionic liquid inhibitors

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