A new triazole derivative as inhibitor of the acid corrosion of mild steel:: electrochemical studies, weight loss determination, SEM and XPS

The effect of addition of 2[5-(2-pyridyl)-1,2,4-triazol-3-yl] phenol (PPT) on mild steel dissolution in 1 M hydrochloric acid is studied through electrochemical impedance spectroscopy (EIS), potentiodynamic polarisation curves and gravimetric measurements. The obtained results showed that PPT revealed a good corrosion inhibition. Potentiodynamic polarisation studies indicate that PPT is a mixed-type inhibitor, The effect of temperature on the corrosion behaviour of mild steel in 1 M HCl with addition of 80 mg/l of PPT was studied in the temperature range from 25 degrees C to 60 degrees C. The associated activation corrosion and free adsorption energies have been determined. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) of the mild steel revealed that PPT is absorbed on the steel surface. PPT appears to function through the general adsorption mode following the Langmuir adsorption isotherm model. (C) 1999 Elsevier Science B.V. All rights reserved.