Hülya Keleş

Electrochemical investigation of a schiff base synthesized by cinnamaldehyde as corrosion inhibitor on mild steel in acidic medium

The inhibiting effect of (NE)-4-phenoxy-N-(3-phenylallylidene) aniline (PAC) on the corrosion of mild steel in 1.0xa0M HCl has been studied by electrochemical impedance spectroscopy, and Tafel polarization measurements. The corrosion rate was also calculated theoretically in terms of mm per year and mil per year, using current density values of mild steel in 1.0xa0M HCl medium. It was found that PAC has a remarkable inhibition efficiency on the corrosion of mild steel especially at high temperatures. The values of Ea obtained in presence of a Schiff base were found to be lower than those obtained in the inhibitor-free solution. The increase of inhibition efficiency percent with temperature increase was associated with the transformation of physical adsorption into chemical adsorption. The thermodynamic functions of adsorption processes have been evaluated and discussed at each temperature. Scanning electron microscope observations of the electrode surface confirmed the existence of a protective adsorbed film of the inhibitor on the electrode surface.

Adsorption and anticorrosion behaviour of an imine compound on low carbon steel in HCl solution at different potentials

Abstract The inhibition capability of an imine compound named (2-methoxyphenyl)-N-(2-(phenylthio)phenyl)methanimine (MPM) on low carbon steel corrosion in HCl solution was investigated at various concentrations and temperatures by using electrochemical and microscopic techniques. The electrochemical results revealed that the inhibition efficiency increases with an increase in the MPM concentration, and MPM has provided 98.8% protection for 120 h. Electrochemical studies at different potentials showed that electrostatic effects have an important role on the adsorption of MPM on the metal surface. scanning electron microscopy and energy-dispersive X-ray spectroscopy results also confirmed that MPM has reduced the corrosive effect of HCl.

Protection Effect of 2-(phenylthio)phenyl)-1-(2- (trifluoromethyl)phenyl) methanimine on Low Carbon Steel at Open Circuit and Different Potentials

The inhibition capability of (2-(phenylthio)phenyl)-1-(2-(trifluoromethyl)phenyl) methanimine (PFM) on corrosion of low carbon steel (LCS) in 1.0 M HCl solution was investigated at various potentials and temperatures using electrochemical and microscopic techniques. The electrochemical results showed that the inhibition efficiency increases with increasing PFM concentration. Besides this electrochemical studies at open circuit and different potentiostatic potentials showed that electrostatic effects have an important role on the adsorption of PFM on the metal surface. Time dependent stability of the inhibitor was also investigated by Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The results confirmed that PFM has reduced the corrosive effect of HCl on low carbon steel even 120 h later.