Adsorption behavior of 8,9-bis(4 (dimethyl amino)phenyl)benzo[4,5]imidazo[1,2-a]pyridine-6,7-dicarbonitrile on mild steel surface in 1 M HCl

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• 作者：Chandrabhan Verma ; M.A. Quraishi ; ^{maquraishi.apc@itbhu.ac.in} ; ^{maquraishi@rediffmail.com}
• 关键词：Acid solution ; Mild steel ; EIS ; Polarization ; AFM/SEM/EDX ; Quantum chemical calculation SEM and AFM studies
• 刊名：Journal of the Association of Arab Universities for Basic and Applied Sciences
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：22
• 期：Complete
• 页码：55-61
• 全文大小：2236 K
• 卷排序：22

文摘

The effect of 8,9-bis(4 (dimethylamino)phenyl)benzo[4,5]imidazo[1,2-a]pyridine-6,7-dicarbonitrile (INH) on mild steel corrosion in 1 M HCl was studied by electrochemical, surface and quantum chemical calculation methods. Results showed that percentage of inhibition efficiency increases on increasing INH concentration. The maximum inhibition efficiency of 96.32% was obtained at 25 mg L−1 concentration. Tafel polarization measurements show that the presence of INH in acid solution affects both cathodic and anodic reactions but acts as predominantly cathodic type inhibitor. The Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM) studies suggest the formation of adherent layer of INH on mild steel surface. The results of theoretical calculations were found to be consistent with the surface and electrochemical results.