苯并咪唑-N-曼尼希碱对盐酸中N80钢的缓蚀性能

doi:10.11902/1005.4537.2014.188

中国腐蚀与防护学报

2015, Vol. 35

Issue (5): 415-422 DOI: 10.11902/1005.4537.2014.188

本期目录 | 过刊浏览

苯并咪唑-N-曼尼希碱对盐酸中N80钢的缓蚀性能

苏铁军¹(

),罗运柏²,李克华³,李凡修³,邓仕英¹,习伟¹

2. 武汉大学化学与分子科学学院武汉 430072
3. 长江大学化学与环境工程学院荆州 434023

Corrosion Inhibition Performance of Benzimidazole N-Mannich Base for Mild Steel in Hydrochloric Acid

Tiejun SU¹(

),Yunbai LUO²,Kehua LI³,Fanxiu LI³,Shiying DENG¹,Wei XI¹

1. College of Technology and Engineering, Yangtze University, Jingzhou 434020, China
2. College of Chemistry and Molecule Science, Wuhan University, Wuhan 430072, China
3. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China

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摘要:

采用静态失重、动电位极化、电化学阻抗等方法研究了两种苯并咪唑-N-曼尼希碱 (PAB和PPB) 在盐酸介质中对N80钢的缓蚀性能。结果表明：两种缓蚀剂均为混合控制型缓蚀剂,都能自发吸附于碳钢表面,其行为符合Langmuir吸附等温式。PPB的缓蚀性能好于PAB,这与量子化学计算和分子动力学模拟的结论相吻合。

关键词 ：苯并咪唑衍生物, 缓蚀剂, 电化学测试, 量子化学计算, 分子动力学模拟

Abstract：

The inhibition performance of two compounds of benzimidazole N-mannich base namely PAB and PPB for N80 steel in HCl solution was investigated by means of weight loss test, potentiodynamic polarization and electrochemical impedance spectroscopy. The results showed that both PAB and PPB were mixed-type inhibitor, and were adsorbed on the surface of mild steel spontaneously; whilst PPB has higher inhibition efficiency than that of PAB, which accorded well with theoretical prediction. Furthermore,the adsorption of both PAB and PPB follows Langmuir isotherm law.

Key words： benzimidazol derivative corrosion inhibitor electrochemical measurement quantum chemistry calculation molecular dynamics simulation

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基金资助:长江大学工程技术学院科研基金项目 (13J0603) 资助

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引用本文:

苏铁军, 罗运柏, 李克华, 李凡修, 邓仕英, 习伟. 苯并咪唑-N-曼尼希碱对盐酸中N80钢的缓蚀性能[J]. 中国腐蚀与防护学报, 2015, 35(5): 415-422.
Tiejun SU, Yunbai LUO, Kehua LI, Fanxiu LI, Shiying DENG, Wei XI. Corrosion Inhibition Performance of Benzimidazole N-Mannich Base for Mild Steel in Hydrochloric Acid. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 415-422.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.188 或 https://www.jcscp.org/CN/Y2015/V35/I5/415

图1 两种缓蚀剂分子结构

表1 两种化合物的熔点和IR数据

表2 失重法测试结果

图2 不同缓蚀剂浓度下N80钢的极化曲线

表3 未加缓蚀剂和加入不同浓度缓蚀剂后N80钢的极化曲线参数

图3 加入不同浓度缓蚀剂后试样的Nyquist曲线

图4 等效电路

表4 未加和加入不同浓度缓蚀剂后N80钢的阻抗谱拟合参数

图5 PAB和PPB的吸附等温线

表5 PAB和PPB在N80钢表面的吸附热力学参数

图6 PAB和PPB的分子前线轨道分布

表6 PAB, PPB及Fe的前线轨道能量

图7 PAB和PPB的平衡吸附构型

表7 缓蚀剂分子与Fe (001) 面的吸附能

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