凤眼莲提取物在<strong>Cl<sub>2</sub>CHCOOH</strong>溶液中对钢的绿色缓蚀及界面行为评估

doi:10.11902/1005.4537.2025.198

中国腐蚀与防护学报

2026, Vol. 46

Issue (3): 893-902 CSTR: 32134.14.1005.4537.2025.198 DOI: 10.11902/1005.4537.2025.198

研究报告

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凤眼莲提取物在Cl₂CHCOOH溶液中对钢的绿色缓蚀及界面行为评估

江成, 魏高飞, 蒲美婷, 徐娟, 李向红(

), 邵丹丹(

)

西南林业大学材料与化学工程学院西南地区林业生物质资源高效利用国家林业和草原局重点实验室昆明 650224

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

引用本文:

江成, 魏高飞, 蒲美婷, 徐娟, 李向红, 邵丹丹. 凤眼莲提取物在Cl₂CHCOOH溶液中对钢的绿色缓蚀及界面行为评估[J]. 中国腐蚀与防护学报, 2026, 46(3): 893-902.
Cheng JIANG, Gaofei WEI, Meiting PU, Juan XU, Xianghong LI, Dandan SHAO. Corrosion Inhibition and Interface Behavior of Eichhornia Crassipes Extract on Steel in Cl₂CHCOOH Solution[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 893-902.

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摘要:

以入侵水生植物凤眼莲为原料，通过回流提取法制备凤眼莲提取物(ECE)，综合采用电化学、失重法、表面形貌表征和溶液理化性质分析ECE作为环境友好型缓蚀剂对冷轧钢在0.1 mol·L^-1 Cl₂CHCOOH中的缓蚀性能。结果表明，在30 ℃时100 mg·L^-1的ECE溶液达到最大缓蚀效率91.8%，ECE在冷轧钢表面的吸附遵循物理和化学混合吸附机制，且符合Langmuir等温吸附模型。动电位极化曲线显示为同时抑制阴极和阳极反应，其机理遵循“几何覆盖效应”。Nyquist图呈现着随着ECE浓度增大容抗弧增大，同时极化电阻(R_p)增大5~9.5倍。微观形貌表征表明ECE负载后腐蚀大幅减缓；表面张力(σ)测试表明，ECE的加入使界面张力减小。理论计算结果显示，质子化后的分子自由体积分数(FFV)存在着上升趋势，导致质子化后分子的吸附产生减弱作用，从分子层面揭示分子结构对缓蚀性能的影响。

关键词 ：凤眼莲, 冷轧钢, 缓蚀, 吸附, 理论计算

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

收稿日期: 2025-06-24 32134.14.1005.4537.2025.198

ZTFLH:

TG174

基金资助:国家自然科学基金(32260367);国家自然科学基金(32360362);云南省应用基础研究基金(202301AT070228);云南省农业基础研究联合重点项目(202301BD070001-158);云南省农业联合项目(202301BD070001-053)

通讯作者: 邵丹丹，E-mail：shawn@swfu.edu.cn，研究方向为纳滤膜和绿色缓蚀剂李向红，E-mail：xianghong-li@163.com，研究方向为缓蚀剂

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

作者简介: 江成，男，2001年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.198 或 https://www.jcscp.org/CN/Y2026/V46/I3/893

图1 ECE提取路线

图2 不同温度下 ECE 对冷轧钢在 0.1 mol·L-1 DCA溶液中的失重评估

表1 c/θ-c 的线性拟合参数和标准吸附Gibbs自由能

图3 ECE在冷轧钢表面的Langmuir吸附等温式

图4 lnK和1/T拟合直线

图5 ECE对冷轧钢在 0.1 mol·L-1 DCA溶液中电化学评估

表2 30 ℃时冷轧钢在不含和含有不同浓度ECE在0.1 mol·L-1 DCA溶液中的动电位极化曲线拟合参数

表3 30 ℃时冷轧钢在不含和含有ECE在 0.1 mol·L-1 DCA溶液中的EIS拟合参数

图6 30 ℃时溶液的理化性质相关系数

图7 ECE对冷轧钢在0.1 mol·L-1 DCA溶液中浸泡6 h后表面形貌和疏水性变化

图8 两种中性分子及其质子化衍生物分子的理论参数及活性位点计算

图9 空腔自由体积(FFV)模拟

图10 活性分子的均方根位移曲线(MSD)和扩散系数(D)的模拟结果

图11 冷轧钢的腐蚀和缓蚀机制

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