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首页> 外文期刊>RSC Advances >L-Proline-promoted synthesis of 2-amino-4-arylquinoline-3-carbonitriles as sustainable corrosion inhibitors for mild steel in 1 M HCl: experimental and computational studies
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L-Proline-promoted synthesis of 2-amino-4-arylquinoline-3-carbonitriles as sustainable corrosion inhibitors for mild steel in 1 M HCl: experimental and computational studies

机译：L-脯氨酸 - 促进2-氨基-4-芳基喹啉-3-碳腈的合成，作为可持续腐蚀抑制剂在1M HCl中的温和钢：实验和计算研究

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摘要

The inhibition of mild steel corrosion in 1 M HCl by 2-amino-4-(4-nitrophenyl) quinoline-3-carbonitrile (AAC-1), 2-amino-4-phenylquinoline-3-carbonitrile (AAC-2) and 2-amino-4-(4-hydroxyphenyl) quinoline-3-carbonitrile (AAC-3) has been investigated using weight loss, electrochemical (potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)), surface (SEM, EDX and AFM) and quantum chemical calculation methods. The results indicated that the investigated inhibitors exhibited good inhibition efficiency against the corrosion of mild steel in acidic solution. The weight loss and electrochemical results suggested that inhibition efficiencies were enhanced with an increase in the concentration of 2-amino-4-arylquinoline-3-carbonitriles (AACs). The results showed that the inhibition efficiencies of the investigated AACs obeyed the order: AAC-3 (96.52%), AAC-2 (95.65%) and AAC-1 (94.78%). Potentiodynamic polarization study revealed that the investigated AACs act as cathodic type inhibitors. Adsorption of the AACs on a mild steel surface obeyed the Langmuir adsorption isotherm. Furthermore, SEM, EDX and AFM studies clearly revealed the film-forming ability of AACs on the mild steel surface. Quantum chemical calculations were undertaken to provide mechanistic insight into the mechanism of inhibition action of AACs. On the basis of experimental and theoretical studies it was concluded that the presence of electron releasing hydroxyl (-OH) groups in AAC-3 increases the inhibition efficiency whereas electron withdrawing nitro (-NO2) groups in AAC-1 decrease the inhibition efficiency.
机译：通过2-氨基-4-（4-硝基苯基）喹啉-3-腈（AAC-1），2-氨基-4-苯基喹啉-3-腈（AAC-2）和抑制在1M HCl中的温和钢腐蚀的抑制使用减肥，电化学（电位偏振和电化学阻抗谱（EIS），表面（SEM，EDX和AFM）和2-氨基-4-（4-羟基苯基）喹啉-3-腈（AAC-3）研究了喹啉-3-腈（AAC-3）。量子化学计算方法。结果表明，研究抑制剂对酸性溶液中的低碳钢腐蚀表现出良好的抑制效率。减肥和电化学结果表明，增强了抑制效率，随着2-氨基-4-芳基喹啉-3-碳腈（AAC）的浓度而增加。结果表明，调查AACS的抑制作用措施遵守命令：AAC-3（96.52％），AAC-2（95.65％）和AAC-1（94.78％）。电位动力学偏振研究表明，调查的AACS充当阴极型抑制剂。在温和的钢表面上吸附AACs的术语术语术后钢板吸附等温线。此外，SEM，EDX和AFM研究清楚地揭示了MILD钢表面上AAC的成膜能力。对量子化学计算进行了机械洞察AACs抑制作用机制。在实验和理论研究的基础上，得出结论，AAC-3中的电子释放羟基（-OH）基团的存在提高了AAC-1中的吸电子硝基（-NO2）的抑制效率降低了抑制效率。

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  • 来源
    《RSC Advances》 |2015年第104期|共14页
  • 作者

    Verma Chandrabhan; Quraishi M. A.; Olasunkanmi L. O.; Ebenso Eno E.;

  • 作者单位

    Banaras Hindu Univ Dept Chem Indian Inst Technol Varanasi 221005 Uttar Pradesh India;

    Banaras Hindu Univ Dept Chem Indian Inst Technol Varanasi 221005 Uttar Pradesh India;

    North West Univ Dept Chem ZA-2735 Mmabatho South Africa;

    North West Univ Dept Chem ZA-2735 Mmabatho South Africa;

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  • 正文语种 eng
  • 中图分类 化学;
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