小蓬草提取物对钢在<strong>HCl</strong>介质中的缓蚀作用

doi:10.11902/1005.4537.2023.364

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1189-1199 CSTR: 32134.14.1005.4537.2023.364 DOI: 10.11902/1005.4537.2023.364

研究报告

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小蓬草提取物对钢在HCl介质中的缓蚀作用

石成杰, 雷然, 邓书端, 徐娟, 邵丹丹, 郭青青, 李向红(

)

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 of Erigeron canadensis L.Extract for Steel in HCl Solution

SHI Chengjie, LEI Ran, DENG Shuduan, XU Juan, SHAO Dandan, GUO Qingqing, LI Xianghong(

)

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:

石成杰, 雷然, 邓书端, 徐娟, 邵丹丹, 郭青青, 李向红. 小蓬草提取物对钢在HCl介质中的缓蚀作用[J]. 中国腐蚀与防护学报, 2024, 44(5): 1189-1199.
Chengjie SHI, Ran LEI, Shuduan DENG, Juan XU, Dandan SHAO, Qingqing GUO, Xianghong LI. Corrosion Inhibition of Erigeron canadensis L.Extract for Steel in HCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1189-1199.

全文: PDF(6176 KB) HTML

摘要:

以外来入侵杂草小蓬草(Erigeron canadensis L.)为原料通过超声波辅助提取制备小蓬草提取物(ECE)。利用失重法、电化学法、金属表面测试表征首次研究了以ECE作为缓蚀剂对钢在1.0 mol/L HCl介质中的缓蚀性能及作用机理。结果表明：ECE对钢在1.0 mol/L HCl介质中具有良好的缓蚀性能，缓蚀率随ECE浓度的增加而增大。40℃下，300 mg/L的ECE的缓蚀率最佳，达到93.7%。ECE在钢表面的吸附符合Langmuir吸附等温模型。20~50℃下，标准吸附Gibbs自由能范围为-28.37~-27.60 kJ/mol，吸附作用类型为物理吸附与化学吸附相结合的混合吸附。动电位极化曲线表明ECE为通过“几何覆盖效应”作用的混合抑制型缓蚀剂；Nyquist图谱呈单一容抗弧，钢/酸界面的电荷转移电阻随ECE浓度升高而增大，同时，双电层电容下降。金相显微镜、原子力显微镜(AFM)、接触角、FTIR和UV-Vis等测试表明ECE吸附在钢表面形成缓蚀膜层后使钢在HCl介质中的腐蚀明显减缓，并增强了钢表面的疏水能力。

关键词 ：小蓬草提取物, 缓蚀, 钢, 盐酸, 吸附

Abstract：

The extract of invasive alien weed Erigeron canadensis L. (ECE) was prepared by ultrasound-assisted extraction. The corrosion inhibition performance of ECE as a corrosion inhibitor on steel in 1.0 mol/L HCl solution had been investigated by means of mass loss measurement, electrochemical method and metal surface characterization. The results show that ECE has good corrosion inhibition performance on steel in 1.0 mol/L HCl solution, and the corrosion inhibition rate increases with the increase of ECE concentration. Among others the corrosion inhibition rate of 300 mg·L^-1 ECE at 40^oC is the best, reaching 93.7%. The adsorption of ECE on steel surface is consistent with Langmuir adsorption isotherm. The standard adsorption Gibbs free energy ranges from -28.37 kJ/mol to -27.60 kJ/mol at 20-50^oC, and adsorption is a mixed type of physical and chemical adsorption. The potentiodynamic polarization curves show that ECE is a mixed inhibitor corrosion inhibitor acting through "geometrical overlay effect". The Nyquist plot shows a single capacitive resistance arc, and the charge transfer resistance at the steel/acid interface increases with increasing ECE concentration, while the capacitance of the double layer decreases. Examination results of metallographic microscopy, atomic force microscopy (AFM), contact angle, FTIR and UV-Vis show that the adsorption of ECE induced the formation a corrosion inhibition film on the steel surface significantly slows down steel corrosion in HCl solution and enhances the hydrophobicity of the steel surface.

Key words： Erigeron canadensis L. extract corrosion inhibition steel hydrochloric acid adsorption

收稿日期: 2023-11-20 32134.14.1005.4537.2023.364

ZTFLH:

TG174

基金资助:国家自然科学基金(52161016);云南省基础研究计划杰出青年基金(202001AV070008);云南省农业基础研究联合专项重点项目(202101BD070001-017);云南省万人计划青年拔尖人才专项(51900109);西南林业大学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开放基金项目(2022-KF08);云南省大学生创新创业训练计划(s202310677069)

通讯作者: 李向红，E-mail: xianghong-li@163.com，研究方向为缓蚀剂

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

作者简介: 石成杰，男，2001年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.364 或 https://www.jcscp.org/CN/Y2024/V44/I5/1189

图1 不同温度下缓蚀率、腐蚀速率与ECE浓度的关系曲线

图2 c/θ-c的拟合直线

表1 c/θ-c的线性拟合参数

图3 lnK-1/T的拟合直线

表2 吸附热力学参数

图4 Arrhenius和过渡状态拟合直线

图5 腐蚀动力学参数随ECE浓度的变化曲线

图6 20℃时钢在含有不同浓度的ECE的1.0 mol/L HCl介质中的动电位极化曲线

表3 动电位极化曲线参数

图7 20℃时钢在不含和含有ECE的1.0 mol/L HCl溶液中的EIS及其等效电路

表4 EIS拟合参数

图8 钢表面的金相显微镜形貌和接触角

图9 钢表面AFM微观形貌

表5 钢表面粗糙度参数

图10 缓蚀溶液UV光谱

图11 EC、ECE和钢表面吸附层的FTIR光谱

图12 钢浸泡在含ECE的1.0 mol/L HCl中的腐蚀及缓蚀机理示意图

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