Plantago major extract as an environmentally friendly inhibitor for the corrosion of l-80 carbon steel in 0.5 m H2SO4 media

Abstract

The inhibition impact of Plantago major leaves extract on carbon steel (CS) which immersed in 0.5 M H2SO4 media was investigated by several methods such as mass loss method (ML), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and electrochemical frequency modulation (EFM). Data obtained from different measurements was showed that %IE enhanced with added the Plantago major extract doses also increased with increasing temperature degree. Thermodynamic adsorption and kinetic parameters of the system were also measured and studied. The adsorption of the Plantago major extract on CS is, according to Temkin isotherm. The curves from PDP explained that the Plantago major extract is considered as a mixed-type inhibitor. The EIS technique's acquired data verified that the studied extract produced a thin layer that covers and protects the CS surface. Atomic Force Microscopy (AFM) and Fourier Transform Infrared (FT-IR) analysis conformed that Plantago major extract was adsorbed on CS surface. The data obtained from unlike measurements were in good accord.