Experimental and theoretical studies of benzaldehyde thiosemicarbazone derivatives as corrosion inhibitors for mild steel in acid media

被引：39
|
作者：
Zhang, H. H. [1 ]
Chen, Y. [1 ]
机构：
[1] Binzhou Univ, Dept Chem Engn & Safety, Binzhou 256600, Shandong, Peoples R China
来源：
JOURNAL OF MOLECULAR STRUCTURE | 2019年 / 1177卷
基金：
中国国家自然科学基金;
关键词：
Mild steel; Inhibition; Polarization; EIS; Quantum chemical calculation; 1 M HCL; CARBON-STEEL; SCHIFF-BASE; COPPER CORROSION; PART II; ADSORPTION; BENZIMIDAZOLE; TEMPERATURE; RESISTANCE; PROTECTION;
D O I：
10.1016/j.molstruc.2018.09.048
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The inhibition behavior of three benzaldehyde thiosemicarbazone derivatives namely p-methoxybenzaldehyde thiosemicarbazone (MOBT), p-carboxybenzaldehyde thiosemicarbazone (COBT) and p-ethylbenzaldehyde thiosemicarbazone (EBT) for mild steel in 1.0 M HCl solution was studied systematically using gravimetric measurements, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy and energy dispersive spectrum. Gravimetric measurements revealed that the corrosion rate decreased with the increase of inhibitor concentration and COBT inhibitor exhibited the highest inhibition efficiency of 96.4% at 300 mu M. Potentiodynamic polarization results suggested that these three compounds acted as mixed-type inhibitors. Adsorption of these three inhibitors on mild steel surface in 1.0 M HCl solution conforms to Langmuir adsorption isotherm. Theoretical calculations were also performed and the results agreed well with the experimental measurements. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：90 / 100
页数：11
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