Adsorption behavior and corrosion inhibitive potential of xanthene on mild steel/sulphuric acid interface

被引：41

作者：

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

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

机构：

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

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

来源：

ARABIAN JOURNAL OF CHEMISTRY | 2012年 / 5卷 / 01期

关键词：

Xanthene; Mild steel corrosion inhibitors; Density functional theory (DFT); Sulphuric acid; STEEL CORROSION; ALUMINUM CORROSION; HYDROCHLORIC-ACID; ABSOLUTE ELECTRONEGATIVITY; ELECTRONIC-STRUCTURE; CARBON-STEEL; DERIVATIVES; HARDNESS; IONS; IRON;

D O I：

10.1016/j.arabjc.2010.08.004

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The inhibition of xanthene (XEN) on the corrosion of mild steel in 0.5 M H2SO4 was studied by gravimetric and UV-visible spectrophotometric methods at 303-333 K. Results obtained show that XEN act as inhibitor for mild steel in H2SO4 solution. The inhibition efficiency was found to increase with increase in XEN concentration but decreased with temperature. Activation parameters and Gibbs free energy for the adsorption process using Statistical Physics were calculated and discussed. The corrosion process in 0.5 M H2SO4 in the absence and presence of XEN follows zero-order kinetics. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a XEN-Fe complex. Quantum chemical calculations using DFT were used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of xanthene. (C) 2010 King Saud University. Production and hosting by Elsevier B.V. All rights reserved.

引用

页码：121 / 133

页数：13

共 77 条

[1] A novel azo dye, 8-quinolinol-5-azoantipyrine as corrosion inhibitor for mild steel in acidic media [J].