Electrochemical and quantum chemical studies of some Schiff bases on the corrosion of steel in H2SO4 solution

• Published in: Applied surface science 2007-02, Vol.253 (8), p.3913-3921
• Main Authors: HASANOV, Rovshan, SADIKOGLU, Murat, BILGIC, Semra
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Physics
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2006.08.025

The efficiency, as steel-corrosion inhibitors in 0.1M and 1M H2SO4, of two Schiff bases, 2-{[(4-methoxyphenyl)imino]methyl}phenol and 1-{[(4-methoxyphenyl)imino]methyl}-2-naphthol, (abbreviated SB-1 and SB-2, respectively) was investigated by Tafel extrapolation and linear polarization methods. Corrosion parameters and adsorption isotherms were determined from current-potential curves. It was found that the percent inhibition efficiencies (eta%) and surface coverage (theta) increase with an increases in the concentrations of inhibitors. The results showed that these compounds act as good corrosion inhibitors especially at high concentrations. The adsorption of used compounds on the steel surface obeys Langmuir's isotherm. Obvious correlation was found between corrosion inhibition efficiency and quantum chemical parameters obtained by B3LYP/6-31g(d) method. The obtained theoretical results have been compared with the experimental findings.