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

Abstract

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.