Inhibition of Mild Steel Corrosion in 1M HCl Medium by Acid Extract of Haloxylon scoparium Pomel

The present work sheds some light on the inhibition effect of acidic extract of Haloxylon Scoparium pommel on the corrosion of steel (X52) in acid solution of hydrogen chloride (1M) using the electrochemical measurements (electrochemical polarization resistance, electrochemical impedance spectrum, and scanning electron microscopic studies). The results revealed that the extract could serve as an effective mixed mode inhibitor for mild steel in HCl media. The electrochemical impedance spectroscopy findings showed that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the variation in extract concentration is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. This could be observed on the image obtained by electron microscopic scanning.