The inhibition effect of
Parthenium hystophrous
L extract on the corrosion of mild steel in 1N
sulphuric acid has been studied at different concentrations as well as different temperatures of inhibitor by mass loss
studies, adsorption isotherms, Tafel polarization and electrochemical impedance spectroscopy (EIS) between 308 and
338K. The exposed mild steel surface in the presence of inhibitor using Scanning Electron Microscope (SEM) is also
studied. The corrosion rate increased with increase in temperature and decrease with increase in concentration of
inhibitor compared to blank. The adsorption of this extracts has been found to obey Tempkin and Langmuir
adsorption isotherm. Polarization results reveal that the extract is a mixed type inhibitor. The maximum inhibition
efficiency of this extract observed at room temperature is 95.12%. @ JASEM
