Inhibitory Performance of Moringa Leaf Extract on Corrosion of Steel in H2SO4 Solution

doi:10.11902/1005.4537.2025.207

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (3): 743-755 DOI: 10.11902/1005.4537.2025.207

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Inhibitory Performance of Moringa Leaf Extract on Corrosion of Steel in H₂SO₄ Solution

GUO Chongnan¹, ZHU Ping¹^,², TANG Liqing¹, LI Xianghong¹, XU Juan¹(

)

^1.National Joint Engineering Research Center for Highly-Efficient Utilization Technology of Forestry Resources, College of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, China
^2.Yunnan Provincial Special Equipment Safety Testing and Research Institute, Kunming 650228, China

Cite this article:

GUO Chongnan, ZHU Ping, TANG Liqing, LI Xianghong, XU Juan. Inhibitory Performance of Moringa Leaf Extract on Corrosion of Steel in H₂SO₄ Solution. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 743-755.

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Abstract

Herein, Moringa leaf extract (MLE) was prepared via an ultrasound-assisted extraction method, and of which the potential chemical functional groups were characterized by means of Fourier transform infrared spectroscopy (FTIR). Next, the corrosion inhibition performance of MLE for cold-rolled steel in 0.5 mol/L H₂SO₄ solution was systematically investigated via weight loss measurements, electrochemical measurements, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) etc. The results demonstrate that with a dosage of 100 mg/L MLE, a corrosion inhibition efficiency of 90.06% may be reached for cold-rolled steel in 0.5 mol/L H₂SO₄ solution at 30 ℃. The adsorption of MLE on the surface of cold rolled steel follows Langmuir and Freundlich isothermal models. The calculated standard adsorption Gibbs free energy (∆G⁰) ranges from -26.12 to -31.86 kJ·mol^-1, indicating that the adsorption is mainly a mixed mode of physical and chemical adsorption, and confirmed that MLE has the best adsorption performance at 30 ℃. Electrochemical analysis also confirmed that MLE acts as a mixed-type inhibitor. Its primary mechanism involves increasing the charge transfer resistance at the steel/acid interface, thereby effectively inhibiting the electrochemical corrosion process. The presence of MLE will reduce the surface roughness and hydrophilicity of steel; Furthermore, XPS analysis further revealed that the key mechanism of MLE's corrosion inhibition was the formation of an adsorption film on steel surface, quantum chemical calculations show that the oxygen-containing groups in MLE serve as active adsorption sites. It provided a new idea for the high value utilization of moringa leaves in industrial anticorrosion.

Key words: moringa leaf extract H₂SO₄ cold-rolled steel adsorption inhibitor

Received: 02 July 2025 32134.14.1005.4537.2025.207

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(32360362);National Natural Science Foundation of China(52161016);Yunnan Agricultural Research Joint Key Projects(202301BD070001-158);Yunnan Provincial Academician Workstation(202305AF150009);Doctoral Research Initiation Fund of Southwest Forestry University(110224051)

Corresponding Authors: XU Juan, E-mail: 58045846@qq.com

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	GUO Chongnan
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	TANG Liqing
	LI Xianghong
	XU Juan

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.207 OR https://www.jcscp.org/EN/Y2026/V46/I3/743

Fig.1 Extraction process of MLE

Fig.2 Relationship between corrosion rate and MLE concentration of steel (a) and the relationship between corrosion inhibition rate and MLE concentration of steel (b) at different temperature

Fig.3 Langmuir fitted line (a) and freundlich fitted line (b) at different temperatures

Table 1 Langmuir(c/θ-c) and Freundlich (lnθ-lnc) linear fitting parameters of MLE adsorption on cold rolled steel surface at different temperatures

Fig.4 Arrhenius Equation fitting line (a), transition state equation fitting line (b) and Relationship between corrosion kinetics parameters and concentration of MLE (c)

Table 2 Corrosion kinetics parameters of MLE at different temperature on the surface of cold-rolled steels

Fig.5 Electrochemical tests on 30 ℃ cold rolled steel in 0.5 mol/L H₂SO₄ solution containing different concentrations of MLE. (a) Polarization curves, (b) Nyquist plots, (c) Bode phase angle plots and Bode modulus, (d) equivalent circuit diagram

Table 3 Fitting parameters by potential tafel extrapolation

Table 4 R_s(QR_t) equivalent circuit fitting parameters of cold-rolled steel in H₂SO₄ solution without adding MLE and with different concentrations of MLE at 30 ℃

Fig.6 Surface contact angle (a-c) and surface metallurgies (d, e) of cold-rolled steel after 6 h immersion in 0.5 mol/L H₂SO₄ without adding (a, d) and 10 mg/L (b), 100 mg/L (c, e) of MLE at 30 ℃

Fig.7 AFM microtopographies of cold-rolled steel after immersion at 30 ℃ for 6 h in 0.5 mol/L H₂SO₄ solution without (a) and with (b) 100 mg/L MLE

Table 5 AFM roughness parameter

Fig.8 XPS analysis results of cold-rolled steel immersed in 0.5 mol/L H₂SO₄ solution containing 100 mg/L MLE for 6 h at 30 ℃: (a) survey, (b) C 1s, (c) N 1s, (d) O 1s, (e) S 2p, (f) Fe 2p

Fig.9 Optimized structure (a1-a3), LUMO (a4-a6), HOMO (a7-a9), electro density (a10-a12) maps (a) and Fukui function distributions (b-d) of Methyl-4-caffeoylquinate (a1, a4, a7, a10), 3,4-dihydroxy-benzoic acid (a2, a5, a8, a11) and 5-hydroxymethyl-2-furancarboxylic acid (a3, a6, a9, a12), and FTIR spectrum of MLE (e)

Table 6 QC calculation parameters of three different types of molecules from MLE

Fig.10 Schematic illustration of corrosion inhibition mechanism of MLE on cold-rolled steel

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