Indeno-1-one [2,3-b]quinoxaline as an effective inhibitor for the corrosion of mild steel in 0.5 M H2SO4 solution

被引：117

作者：

Obot, I. B. ^{[1
]}

Obi-Egbedi, N. O. ^{[2
]}

机构：

[1] Univ Uyo, Fac Sci, Dept Chem, Uyo, Akwa Ibom State, Nigeria

[2] Univ Ibadan, Dept Chem, Ibadan, Nigeria

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2010年 / 122卷 / 2-3期

关键词：

Indeno-1-one [2,3-b] quinoxaline; Corrosion inhibitors; Density functional theory (DFT); Sulphuric acid; ADSORPTION CHARACTERISTICS; ALUMINUM CORROSION; ACID CORROSION; IODIDE-IONS; 2,3-DIAMINONAPHTHALENE; DERIVATIVES; HCL;

D O I：

10.1016/j.matchemphys.2010.03.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Indeno-1-one [2,3-b] quinoxaline (INQUI), synthesized in our laboratory, was tested as inhibitor for the corrosion of mild steel in 0.5 M H2SO4 using gravimetric method at 30 degrees C. The inhibitor (INQUI) showed about 81% inhibition efficiency (E (%)) at an optimum concentration of 10 x 10(-6) M. The inhibition efficiency increases with increase in inhibitor concentration but decreases with increase in immersion time. The adsorption of the inhibitor on the mild steel in the acid solution was found to accord with Temkin's adsorption isotherm. The calculated value of the free energy for the adsorption process. Delta G(ads), reveals a strong chemisorbed bond between the inhibitor and mild steel surface and a spontaneous adsorption of the inhibitor on the mild steel surface. Density functional theory (DFT) proves that INQUI molecule is adsorbed on the mild steel surface by the most negatively charged nitrogen and oxygen atoms. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：325 / 328

页数：4

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