槐米提取物对Al在HCl溶液中的缓蚀作用

doi:10.11902/1005.4537.2021.337

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 939-947 DOI: 10.11902/1005.4537.2021.337

研究报告

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槐米提取物对Al在HCl溶液中的缓蚀作用

雷然, 石成杰, 李向红(

)

西南林业大学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 Aluminum in HCl Solution by Flos Sophorae Immaturus Extract

LEI Ran, SHI Chengjie, LI Xianghong(

)

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

引用本文:

雷然, 石成杰, 李向红. 槐米提取物对Al在HCl溶液中的缓蚀作用[J]. 中国腐蚀与防护学报, 2022, 42(6): 939-947.
Ran LEI, Chengjie SHI, Xianghong LI. Corrosion Inhibition of Aluminum in HCl Solution by Flos Sophorae Immaturus Extract[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 939-947.

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摘要:

利用超声波提取法对槐米 (FSI) 进行提取得到槐米提取物 (FSIE),并采用失重法和电化学法研究了FSIE作为缓蚀剂对Al在1.0 mol/L HCl溶液中的缓蚀作用,同时通过红外光谱 (FTIR) 测定了FSIE及Al表面缓蚀膜层的官能团结构。FSIE对Al在1.0 mol/L HCl溶液中有明显的腐蚀抑制效果,缓蚀性能随着FSIE浓度增大而增强；温度升高,缓蚀性能减弱；当温度为20 ℃,FSIE浓度为500 mg/L时,缓蚀率η_w达到了83.2%。FSIE在Al表面的吸附符合Langmuir吸附等温式,吸附作用类型为以物理吸附为主的物理和化学相结合的混合吸附。动电位极化曲线表明FSIE为阴极抑制型缓蚀剂,Nyquist图谱的高频区容抗弧随FSIE浓度的增大而明显增大,铝/酸界面的电荷转移电阻增大。从微观表面形貌可看出,在添加FSIE的HCl溶液中,Al表面的腐蚀程度和粗糙度明显减小。

关键词 ：槐米提取物, Al, 盐酸, 缓蚀, 吸附

Abstract：

Flos Sophorae Immaturus extract (FSIE) was acquired by ultrasonic extraction method with ethanol solution as extract agent. The corrosion inhibition of Al-plate in 1.0 mol/L HCl solution by FSIE was studied for the first time by means of mass loss measurement, electrochemical method and surface analysis (SEM and AFM). The functional groups of FSIE and the formed inhibition film on Al is characterized by FTIR. The results show that FSIE has a significant inhibition effect on Al in 1.0 mol/L HCl solution. The inhibition efficiency enhances with the increase of FSIE concentration, while decreases with the increasing temperature. The inhibition efficiency can reaches 83.2% for a dose of 500 mg/L FSIE at 20 ℃. The adsorption of FSIE on Al surface conforms to Langmuir adsorption isotherm, and the adsorption type is a mixture of physical and chemical adsorption while mainly the physical adsorption. Potentiodynamic polarization curves show that FSIE is a cathodic inhibitor that prominently inhibits the cathodic hydrogen evolution. The capacitive arc in Nyquist plot at high frequencies increases with the concentration of PSIE. The inhibited aluminum surface by FSIE exhibits low corrosion extent as well as low surface roughness. FTIR confirms that FSIE can efficiently adsorb on Al surface to from inhibition film.

Key words： Flos Sophorae Immaturus extract Al HCl inhibition adsorption

收稿日期: 2021-11-25

ZTFLH:

TG174

基金资助:国家自然科学基金(52161016);国家自然科学基金(51761036);云南省农业基础研究联合专项(2017FG001(-004));云南省基础研究计划杰出青年项目(202001AV070008);云南省万人计划青年拔尖人才专项(51900109);云南省教育厅科学研究基金(2021J0147);云南省大学生创新创业训练计划(202110677014)

作者简介: 雷然,男,1981年生,博士生,实验师

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https://www.jcscp.org/CN/10.11902/1005.4537.2021.337 或 https://www.jcscp.org/CN/Y2022/V42/I6/939

图1 在不同温度的1.0 mol/L HCl溶液中ηw和v与FSIE浓度的关系图

图2 不同温度下1.0 mol/L盐酸溶液中c/θ-c的拟合直线

表1 Al在不同温度下FSIE含量不同的1.0 mol/L HCl溶液中的吸附参数

图3 不同温度下1.0 mol/L盐酸溶液中lnK-1/T的拟合直线

表2 FSIE在铝表面的吸附热力学参数

图4 不同温度下1.0 mol/L盐酸溶液中lnv-1/T的拟合直线

图5 Al在含FSIE的1.0 mol/L HCl中腐蚀动力学参数随FSIE浓度的变化曲线

图6 Al在20 ℃下含不同浓度FSIE的1.0 mol/L HCl溶液中的动电位极化曲线

表3 Al在20 ℃下含不同浓度FSIE的1.0 mol/L HCl溶液中的动电位极化曲线参数

图7 Al在20 ℃下含不同浓度FSIE的1.0 mol/L HCl溶液中的电化学阻抗谱

图8 EIS数据拟合电路图

表4 Al在20 ℃下不含和含有不同浓度FSIE的1.0 mol/L HCl溶液中的EIS拟合参数

图9 Al在1.0 mol/L HCl溶液中浸泡前后表面SEM形貌

图10 Al在1.0 mol/L HCl 溶液中浸泡前后表面AFM图

表5 铝表面AFM微观结构粗糙度参数

图11 FSI、FSIE以及Al在含有FSIE的HCl溶液中浸泡后表面腐蚀产物的红外光谱图

图12 槐米提取物、槲皮素和芦丁的HPLC图谱

图13 槲皮素和芦丁的标准曲线

图14 槲皮素,芦丁以及Al3+与黄酮类化合物形成的配合物的化学结构式

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