Corrosion Inhibition and Interface Behavior of Eichhornia Crassipes Extract on Steel in Cl2CHCOOH Solution

doi:10.11902/1005.4537.2025.198

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (3): 893-902 DOI: 10.11902/1005.4537.2025.198

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Corrosion Inhibition and Interface Behavior of Eichhornia Crassipes Extract on Steel in Cl₂CHCOOH Solution

JIANG Cheng, WEI Gaofei, PU Meiting, XU Juan, LI Xianghong(

), SHAO Dandan(

)

Key Laboratory of State Forestry and Grassland Administration on Highly-efficient Utilization of Forestry Biomass Resources in Southwest China, College of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, China

Cite this article:

JIANG Cheng, WEI Gaofei, PU Meiting, XU Juan, LI Xianghong, SHAO Dandan. Corrosion Inhibition and Interface Behavior of Eichhornia Crassipes Extract on Steel in Cl₂CHCOOH Solution. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 893-902.

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Abstract

Eichhornia crassipes extract (ECE) was prepared by reflux extraction, with the invasive aquatic plant Eichhornia crassipes as raw material. The corrosion inhibition performance of ECE, as an eco-friendly corrosion inhibitor, for cold-rolled steel in 0.1 mol·L^-1 Cl₂CHCOOH solution was evaluated by means of electrochemical methods, mass loss measurement, surface morphology characterization, and analysis of solution physicochemical properties. Results showed that with a dosage of 100 mg·L^-1 ECE a maximum inhibition efficiency of 91.8% at 30 ℃ may be reached. The adsorption of ECE on the cold-rolled steel surface followed a mixed physical and chemical adsorption mechanism, consistent with the Langmuir isotherm model. Potentiodynamic polarization curves revealed the simultaneous inhibition of both cathodic and anodic reactions, driven by a "geometric coverage effect". Nyquist plots revealed an increase in the capacitive reactance arc with increasing ECE concentration, while the polarization resistance (R_p) increased by 5-9.5 times. Micromorphological characterization also revealed a significant reduction in corrosion after ECE loading, and surface tension (σ) measurements revealed that the addition of ECE reduced interfacial tension. Theoretical calculation results show that the free volume fraction (FFV) of protonated molecules has an upward trend, which leads to a weakening effect on the adsorption of protonated molecules, revealing the influence of molecular structure on corrosion inhibition performance at the molecular level.

Key words: eichhornia crassipes cold rolled steel corrosion inhibition adsorption theoretical calculation

Received: 24 June 2025 32134.14.1005.4537.2025.198

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(32260367);National Natural Science Foundation of China(32360362);Applied Basic Research Foundation of Yunnan Province(202301AT070228);Joint Key Project of Agricultural Fundamental Research in Yunnan Province(202301BD070001-158);Yunnan Provincial Agricultural Joint General Project(202301BD070001-053)

Corresponding Authors: SHAO Dandan, E-mail: shawn@swfu.edu.cnLI Xianghong, E-mail: xianghong-li@163.com

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	JIANG Cheng
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	SHAO Dandan

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.198 OR https://www.jcscp.org/EN/Y2026/V46/I3/893

Fig.1 ECE extraction route

Fig.2 ECE evaluation of mass loss of cold rolled steel in 0.1 mol·L^-1 DCA solution at different temperatures: (a) corrosion inhibition efficiency (η_w); (b) corrosion rate (v)

Table 1 Linear fitting parameters of c/θ-c and standard adsorption Gibbs free energy(ΔG^θ )

Fig.3 Langmuir adsorption isotherm of ECE on surface of cold rolled steel

Fig.4 lnK vs. 1/T fitting straight line

Fig.5 Electrochemical evaluation of cold rolled steel by ECE in 0.1 mol·L^-1 DCA solution: (a) open circuit potential, (b) potentiodynamic polarization curves, (c) Nyquist plots, (d) Bode modulus plots

Table 2 Potentiodynamic polarization curve fitting parameters of cold rolled steel in solutions without and with different concentrations of ECE in 0.1 mol·L^-1 DCA at 30 ℃

Table 3 EIS fitting parameters of cold rolled steel in 0.1 mol·L^-1 DCA solution without and with ECE at 30 ℃

Fig.6 Concentration and conductivity (k) (a) and concentration and surface tension (σ) (b) of solutions at 30 ℃

Fig.7 Surface CLSM morphologies (a1-c1), metallographic images and contact angle pictures (a2-c2) of cold-rolled steel after immersion in 0.1 mol·L^-1 DCA solution for 6 h: (a) polishing, (b) corrosion, (c) ECE protection

Fig.8 Theoretical parameters and active site calculations for two neutral molecules (m-coumaric acid, N,N-Dicyclohexylcarbodiimide) and their protonated derivatives (p-m-coumaric acid, p-N,N-Dicyclohexylcarbodiimide)

Fig.9 Cavity free volume (FFV) simulation: (a) blank model, (b, c) free volume fractions of m-coumaric acid and protonated m-coumaric acid, (d, e) free volume fractions of N,N-Dicyclohexylcarbodiimide and protonated N,N-Dicyclohexylcarbodiimide

Fig.10 Simulation results of root mean square displacement curve (MSD) and diffusion coefficient (D) of active molecules: (a) diffusion coefficients of blank model, (b, c) m-coumaric acid and its protonated form, (d, e) N,N-dicyclohexylcarbodiimide and its protonated form

Fig.11 Corrosion and corrosion inhibition mechanism of cold-rolled steel

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