Author/Authors :
ebich, f. university ibn tofail - faculty of sciences - laboratory of agroresources and process engineering, Kénitra, Morocco , ramdan, r. ibn tofaïl university - faculty of science - laboratory of genetics and biometrics, Kenitra, Morocco , saadouni, m. ibn tofaïl university - faculty of science - laboratory of organic, organometallic and theoretical chemistry, Kenitra, Morocco , el aoufir, y. ibn tofail university - faculty of science - laboratory of separation processes, Kenitra, morocco , el aoufir, y. mohammed v university - faculty of sciences - materials, nanotechnology and environment laboratory, Rabat, Morocco , chaouiki, a. university of ibn zohr - ensa - laboratory of environmental engineering and biotechnology, Agadir, Morocco , chaouiki, a. ibn tofail university - faculty of science - laboratory of separation processes, Kenitra, Morocco , skal, s. mohammed v university - faculty of sciences - materials, nanotechnology and environment laboratory, Rabat, Morocco , zarrouk, a. université mohammed 1^ er - faculté des sciences - lcae, urac18, Oujda, Morocco , oudda, h. ibn tofail university - faculty of science - laboratory of separation processes, Kenitra, Morocco , essamri, a. university ibn tofail - faculty of sciences - laboratory of agroresources and process engineering, Kénitra, Morocco
Abstract :
The polyphenol extract (PPE) from olive mill wastewaters was prepared and evaluated as corrosion inhibitor for mild steel in 1.0 M HCl solution using weight loss tests, polarization and electrochemical impedance spectroscopy measurements. By fitting the gravimetric data, some kinetic parameters were estimated. The adsorption of the inhibitor on the mild steel surface obeyed Langmuir adsorption isotherm. Polarization measurements showed that the inhibitor acts as mixed inhibitor for mild steel in the acidic media. The inhibition efficiency was found to increase with a corresponding increase in the PPE concentration, and the best inhibition of 89% occurred at a PPE concentration of 4 g/L. The results of the corrosion inhibition using three different methods showed narrow differences in the obtained values between the three methods.
Keywords :
Olive mill wastewaters , Corrosion inhibition , Mild steel , HCl, Electrochemical methods
