铁蕨提取物对碳钢在盐酸中的缓蚀行为研究

doi:10.11902/1005.4537.2020.058

中国腐蚀与防护学报

2021, Vol. 41

Issue (3): 376-382 DOI: 10.11902/1005.4537.2020.058

研究报告

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铁蕨提取物对碳钢在盐酸中的缓蚀行为研究

陈文¹(

), 黄德兴¹, 韦奉²

^1.楚雄师范学院化学与生命科学学院楚雄 675000
^2.国家石油天然气管材工程技术研究中心宝鸡 721008

Inhibition Effect of Brainea Insignis Extract Against Carbon Steel Corrosion in HCl Solution

CHEN Wen¹(

), HUANG Dexing¹, WEI Feng²

^1.Department of Chemistry and Life Science, Chuxiong Normal University, Chuxiong 675000, China
^2.Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods, Baoji 721008, China

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摘要:

利用失重法、极化曲线和电化学阻抗谱等方法研究了苏铁蕨提取物 (BIE) 对Q235钢在1 mol·L^-1 HCl溶液中的腐蚀抑制性能。结果表明：BIE可明显减缓碳钢在盐酸溶液中的腐蚀，当BIE浓度增大到560 mg·L^-1时，钢片的腐蚀失重速率降至1.125 g·m^-2·h^-1，缓蚀率达到94.3%。由电化学分析可知，BIE以抑制碳钢阴极腐蚀反应为主；随BIE浓度的增大，金属表面电荷转移过程变得困难，缓蚀性能增强。由极化曲线和电化学阻抗谱拟合计算的最高缓蚀率分别为95.8%和95.3%，与失重法结果吻合。BIE中的缓蚀剂分子在碳钢表面的吸附满足Langmuir、Temkin吸附等温线和EI-Awady热力学-动力学模型，属于非均质性吸附且吸附的有机分子之间应存在相互作用力。光谱分析和表面形貌观察分别证实了BIE分子的吸附和缓蚀作用。

关键词 ： Q235钢, 盐酸, 植物提取液, 吸附, 缓蚀

Abstract：

The inhibition effect of brainea insignis extract (BIE) on the corrosion of Q235 steel in HCl solution was investigated by means of mass loss measurement, polarization curve measurement and electrochemical impedance spectroscopy. The results showed that BIE could effectively inhibit the carbon steel corrosion in HCl solution, as the BIE concentration was up to 560 mg·L^-1, the corrosion rate of Q235 steel decreased to 1.125 g·m^-2·h^-1, namely the corrosion inhibition efficiency reached 94.3%. Electrochemical analysis shows that the BIE extract suppressed mainly the cathodic corrosion reaction. With the increasing concentration of BIE extract, the charge transfer process on the metal surface was hindered increasingly, resulting in enhanced corrosion inhibition performance. The highest corrosion inhibition efficiencies calculated from the fitting of polarization curves and electrochemical impedance spectroscopy were 95.8% and 95.3%, respectively, which were in agreement with the result of mass loss measurement. The adsorption action of BIE molecules on the steel surface followed Langmuir, Temkin adsorption isotherms and the EI-Awady thermodynamic-kinetic model, and belonged to heterogeneous adsorption, whilst there should exist lateral interaction forces between the adsorbed organic molecules. Spectral analysis and surface morphology observations confirmed the existance of the adsorption action and corrosion inhibition of the extract molecules, respectively.

Key words： Q235 steel HCl plant extractive adsorption corrosion inhibition

收稿日期: 2020-04-04

ZTFLH:

TG174

基金资助:国家自然科学基金(51361001)

通讯作者: 陈文 E-mail: chenw@cxtc.edu.cn

Corresponding author: CHEN Wen E-mail: chenw@cxtc.edu.cn

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引用本文:

陈文, 黄德兴, 韦奉. 铁蕨提取物对碳钢在盐酸中的缓蚀行为研究[J]. 中国腐蚀与防护学报, 2021, 41(3): 376-382.
Wen CHEN, Dexing HUANG, Feng WEI. Inhibition Effect of Brainea Insignis Extract Against Carbon Steel Corrosion in HCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 376-382.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.058 或 https://www.jcscp.org/CN/Y2021/V41/I3/376

表1 植物化学方法检测苏铁蕨提取物的主要成分

图1 BIE及其在钢片表面吸附膜的红外谱图

图2 Q235钢表面BIE吸附膜层的XPS谱

图3 Q235钢在含不同浓度BIE的1 mol·L-1盐酸中的腐蚀速率 (vcorr) 及缓蚀率 (IEwL)

图4 Q235钢在含不同浓度BIE的1 mol·L-1盐酸中的极化曲线

表2 Q235钢在含不同浓度BIE的 1 mol·L-1盐酸中的极化曲线参数

图5 Q235钢在含不同浓度BIE的1 mol·L-1盐酸中的Nyquist图

图6 拟合电化学图谱的等效电路图

表3 Q235钢在不同浓度BIE的1 mol·L-1盐酸中的阻抗图谱拟合参数

图7 Langmuir，Temkin吸附等温线和依据El-Awady热力学-动力学模型拟合结果

图8 Q235钢试片在1 mol·L-1 HCl溶液中浸泡6 h后的SEM和CLSM图像

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