Corrosion Inhibition of Peanut Shell Extract on Cold Rolled Steel in Hydrochloric Acid Solution

doi:10.11902/1005.4537.2024.216

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 869-880 DOI: 10.11902/1005.4537.2024.216

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Corrosion Inhibition of Peanut Shell Extract on Cold Rolled Steel in Hydrochloric Acid Solution

QIU Li¹^,², LI Xianghong¹, LEI Sha¹, GUO Qi¹, DENG Shuduan¹(

)

1 College of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, China
2 Architectural Engineering Institute of Yancheng Kindergarten Teachers College, Yancheng 224000, China

Cite this article:

QIU Li, LI Xianghong, LEI Sha, GUO Qi, DENG Shuduan. Corrosion Inhibition of Peanut Shell Extract on Cold Rolled Steel in Hydrochloric Acid Solution. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 869-880.

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Abstract

Peanut shell extract was prepared by reflux method using forestry and agricultural residue of peanut shell as raw materials. The corrosion inhibition properties of the peanut shell extract (PSE) on cold-rolled steel (CRS) in hydrochloric acid (HCl) solution was studied using mass loss measurement, potentiodynamic polarization curve (PDP) and electrochemical impedance spectroscopy (EIS), metallographic microscopy (MM), and scanning electron microscopy (SEM). Additionally, the relationship between the surface tension and conductivity of the corrosion inhibitor solution and the performance of PSE was also investigated. The results indicate that PSE exhibits excellent inhibition properties for CRS in 1.0 mol/L HCl solution, with the inhibition efficiency (η_w) increasing as the concentration of PSE increases. The inhibition efficiency (η_w) can reach up to 93.15% with the addition of 200 mg/L PSE at 40 ℃. However, the inhibition efficiency decreases with higher acid concentration and with longer inhibition time. The adsorption of PSE on the CRS surface follows the Langmuir monolayer adsorption model, with |ΔG⁰| in the range of 20 kJ/mol to 40 kJ/mol. This indicates that the adsorption of PSE on the CRS surface involves a combination of physical and chemical interactions. PSE acts as a mixed inhibitor, effectively inhibiting both the cathodic hydrogen evolution reaction and the anodic dissolution reaction. The Nyquist diagram features a single capacitive reactance arc, indicating that the corrosion of CRS in an acidic medium is primarily inhibited by charge transfer resistance. The microtopography analysis using MM and SEM confirmed that PSE effectively prevented the corrosion of CRS by HCl. In comparison to the bare surface, the surface hydrophobicity of CRS increased after inhibition test. The conductivity of the solution decreased after inhibition test, and the surface tension decreased with increasing PSE concentration. The surface tension of the solution after inhibition test was higher than that before.

Key words: inhibition peanut shell extract cold-rolled steel (CRS) HCl adsorption

Received: 22 July 2024 32134.14.1005.4537.2024.216

ZTFLH:

TG174.42

Fund: National Natural Science Foundation of China(52161016);Fundamental Research Project for Postgraduates in Yunnan Provincial Department of Education(2023Y0696);Joint Key Project of Agricultural Fundamental Research in Yunnan Province(202101BD070001-017);Undergraduate Innovation and Entrepreneurship Training Program in Yunnan Province

Corresponding Authors: DENG Shuduan, E-mail: dengshuduan@163.com

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	QIU Li
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https://www.jcscp.org/EN/10.11902/1005.4537.2024.216 OR https://www.jcscp.org/EN/Y2025/V45/I4/869

Fig.1 Extraction route of PSE

Fig.2 Relationship between corrosion rate (v), inhibition efficiency (η_w) and PSE concentration (c) in 1.0 mol/L HCl solution at 20~50 ℃: (a) v-c, (b) η-c

Fig.3 Relationship of c/θ-c in 1.0 mol/L HCl solution at different temperatures

Table 1 Linear regression parameters between c/θ and c

Fig.4 Fitting line of adsorption thermodynamics of lnK-1/T

Table 2 Adsorption thermodynamic parameters of PSE on steel surface in 1.0 mol/L HCl solution

Fig.5 Relationship between the corrosion inhibition efficiency (η_w), corrosion rate (v), and hydroch-loric acid concentration at 40 ℃: (a) η_w, v-C,(b) lnv-C

Table 3 Parameters of the liner regression between lnv and C at 40 ℃

Fig.6 Curves inhibition efficiency (η_w), corrosion rate (v) with reaction time (t) in hydrochloric acid solution at 40 ℃: (a) η_w、v-t, (b) lg (W₁/W₂)-t

Table 4 Corrosion kinetics parameters of CRS with different soaking time

Fig.7 Polarization curves of steel electrode with and without PSE in 1.0 mol/L HCl solution at 20 ℃

Table 5 PDP parameters of CRS electrode in 1.0 mol/L HCl solution with various PSE concentrations at 20 ℃

Fig.8 Nyquist (a), impedance module (b) and phase angle (c) plots of CRS electrode in 1.0 mol/L HCl solution without and with different concentrations of PSE at 20 ℃, and equivalent circuit (d)

Table 6 EIS parameters of CRS electrode in 1.0 mol/L HCl solution with various PSE concentrations at 20 ℃

Fig.9 Relationship between corrosion inhibitor PSE concentration (c), conductivity (γ) and surface tension (σ): (a) c-γ,(b) c-σ

Fig.10 Metallographic microscopy of CRS surface in 1.0 mol/L HCl solution with and without PSE: (a) freshly CRS, (b) immersion in 1.0 mol/L HCl solution, (c) immersion in 1.0 mol/L HCl solution with 200 mg/L PSE

Fig.11 SEM of CRS surface in 1.0 mol/L HCl solution with and without PSE: (a) freshly CRS, (b) corroded in HCl solution, (c) after addition of 200 mg/L PSE

Fig.12 Water contact angle results of CRS surface before and after immersion tests without and with 200 mg/L PSE: (a) before immersion, (b) after immersion in HCl solution, (c) after immersion in HCl solution with 200 mg/L PSE

Fig.13 Chemical structure formula of compounds: (a) Luteolin, (b) Quercetin, (c) Rutin

Fig.14 Corrosion mechanism of CRS in 1.0 mol/L HCl solution and inhibition mechanism of PSE on CRS

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