Adsorption and Inhibition Behavior of Imidazoline on Steel Surface in Trichloroacetic Acid Solution

doi:10.11902/1005.4537.2020.096

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (3): 353-361 DOI: 10.11902/1005.4537.2020.096

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Adsorption and Inhibition Behavior of Imidazoline on Steel Surface in Trichloroacetic Acid Solution

WANG Lizi, LI Xianghong(

)

College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China

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Abstract

The corrosion inhibition performance of imidazoline (IM) in trichloroacetic acid (Cl₃CCOOH) solution on cold-rolled steel sheet was studied by means of mass loss method, potential polarization curve measurement and electrochemical impedance spectroscopy (EIS) as well as SEM and AFM. The hydrophilicity/hydrophobicity of the steel after immersion in the IM containing solution were assessed by contact angle measurement. While the adsorption mode of IM on the steel surface and the effect of protonation on the adsorption behavior of IE molecules are studied by quantum chemistry. The results show that IM can effectively slow down the corrosion of the cold-rolled steel in 0.10 mol/L Cl₃CCOOH solution, and the corrosion inhibition efficiency exceeds 95% in the solution with 500 mg/L IM at 20 ℃. The adsorption of Cl₃CCOOH on the steel surface is a mixed adsorption following the Langmuir adsorption isotherm. The Nyquist spectrum of the steel in 0.10 mol/L Cl₃CCOOH solution without and with addition of IM is all composed of capacitive reactance arc in the high frequency region and inductive arc in the low frequency region. However, after IM addition, the charge transfer resistance, inductor resistance and inductance value all increase significatly, meanwhile, the corrosion degree of the steel drops sharply. The contact angle test result showed that after IM addition, the hydrophobicity of the steel surface increased. Quantum chemical calculation results show that IM could easy be protonized to generate p-IM, therewith weakened its ability as electron donor whereas, strengthened that as electron acceptor.

Key words: imidazoline steel trichloroacetic acid inhibition adsorption quantum chemical calculation

Received: 08 June 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51761036);Training Programs of Young and MiddleAged Academic and Technological Leaders in Yunnan Province(2015HB049);Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan(51900109)

Corresponding Authors: LI Xianghong E-mail: xianghong-li@163.com

About author: LI Xianghong, E-mail: xianghong-li@163.com

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Cite this article:

WANG Lizi, LI Xianghong. Adsorption and Inhibition Behavior of Imidazoline on Steel Surface in Trichloroacetic Acid Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 353-361.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.096 OR https://www.jcscp.org/EN/Y2021/V41/I3/353

Fig.1 Variations of the corrosion inhibition rate (η_w) of IM on test steel with the concentration (c) of IM in 0.10 mol/L Cl₃CCOOH

Fig.2 Langmuir isotherm adsorption mode of IM on test steel in 0.10 mol/L Cl₃CCOOH solution

Table 1 Linear regression parameters of c/θ-c and ΔG⁰ at different temperatures

Fig.3 Potentiodynamic polarization curves of test steel in Cl₃CCOOH solution at 20 ℃

Table 2 Electrochemical corrosion parameters of test steel in 0.10 mol/L Cl₃CCOOH solution at 20 ℃

Fig.4 Nyquist plots of test steel in Cl₃CCOOH solution at 20 ℃

Fig.5 Equivalent circuit for fitting EIS of test steel in Cl₃CCOOH solition

Table 3 Fitting EIS parameters for test steel in Cl₃CCOOH solution at 20 ℃

Fig.6 SEM surface images of test steel before (a) and after immersion in 0.10 mol/L Cl₃CCOOH solution without inhibitor (b) and with 500 mg/L IM (c) at 20 ℃ for 6 h

Fig.7 3D-AFM images of test steel before (a) and after immersion in 0.10 mol/L Cl₃CCOOH solution without inhibitor (b) and with 500 mg/L IM (c) at 20 ℃ for 6 h

Fig.8 Contact angle images of test steel before (a) and after immersion in 0.10 mol/L Cl₃CCOOH solution without inhibitor (b) and with 500 mg/L IM (c) at 20 ℃ for 6 h

Fig.9 Optimized molecular structures and front-line orbital distributions of IM (a), IM (HOMO) (b), IM (LUMO) (c), p-IM (d), p-IM (HOMO) (e) and p-IM (LUMO) (f)

Table 4 Quantum chemical structural parameters of IM molecule

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