Inhibition of mild steel corrosion in the presence of fatty acid thiosemicarbazides

被引:25
作者
Quraishi, MA [1 ]
Jamal, D
Singh, RN
机构
[1] Aligarh Muslim Univ, Corros Res Lab, Dept Appl Chem, Fac Engn & Technol, Aligarh 202002, Uttar Pradesh, India
[2] Banaras Hindu Univ, Dept Chem, Varanasi 221005, Uttar Pradesh, India
关键词
corrosion inhibition; electrochemical impedance spectroscopy; fatty acids; hydrochloric acid; mild steel; potentiodynamic polarization; sulfuric acid; Temkin's adsorption isotherm; thiosemicarbazides;
D O I
10.5006/1.3279870
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Selected thiosemicarbazides of fatty acids with C-11-C-18 carbon atoms were synthesized and evaluated as corrosion inhibitors of mild steel (MS) in I N hydrochloric acid (HCl) and 1 N sulfuric acid (H2SO4) by weight loss and potentiodynamic polarization methods. The values of activation energy and free energy of adsorption of all the thiosemicarbazides were calculated to investigate the mechanism of corrosion inhibition. The potentiodynamic polarization studies, carried out at room temperature, revealed that all the compounds Mocked the corrosion reactions. The adsorption of all the thiosemicarbazides on the MS surface in both the acid solutions was found to obey Temkin's adsorption isotherm. All of these compounds showed good inhibition efficiency (IE) in both acids. The IE of these compounds was found to vary with the nature and concentration of the compounds, solution temperature, immersion time, and nature of the acids. Electrochemical impedance spectroscopy was also used to investigate the mechanism of corrosion inhibition.
引用
收藏
页码:201 / 207
页数:7
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