Inhibition Effect of Natural Artemisia Oils Towards Tinplate Corrosion in HCl solution: Chemical Characterization and Electrochemical Study

Abstract

The natural Artemisia essential oil (AO) was tested as a green inhibitor for tinplate in de-aerated hydrochloride solution (0.5M HCl), by means of potentiostatic polarization, in the range of temperature from 298 to 338 K. Polarization data obtained reveal that AO performed excellently as a corrosion inhibitor for tinplate corrosion in hydrochloride acid media and acted as a mixed type inhibitor. The inhibition efficiency increases with an increase in AO concentration and attains 81% at 0.5 g/l at 298 K. Also, we ensured that the temperature favors the dissolution of tinplate and becomes increasingly important when the temperature increases. The Langmuir adsorption isotherm was tested for their fit to the experimental data. We also present results of an in situ SEM study on the surface morphology of tinplate electrodes in inhibited and uninhibited electrolytes. The parameters (, and) were estimated and discussed. The fundamental thermodynamic functions were used to glean important information about Artemisia oil inhibitory behavior. *aE*aΔH*aΔS*aΔG