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<p>We report on the preliminary phytochemical screening of the methanolic extract of the aerial parts of <italic>Lepidagathis alopecuroides</italic> and its evaluation as a potential corrosion inhibitor for mild steel in aerated 1.0 M HCl by weight loss and linear polarization measurements. Weight loss measurements were conducted at 303, 313, 323 and 333 K. The results showed that <italic>L. alopecuroides</italic> inhibited the corrosion of mild steel in the acid solution with inhibition efficiency increasing with increase in the concentrations of the plant extract but decreased with increase in temperature. Linear polarization plots showed the plant extract to inhibit both the dissolution of the steel at the anode and the hydrogen evolution reaction (HER) at the cathode making it a mixed inhibitor. Temkin adsorption isotherms best modeled the adsorption of <italic>L. alopecuroides</italic> extract on the steel surface. From the values of the evaluated kinetic activation parameters in the study, the mechanism of physisorption is proposed for the adsorption of the plant extract on the steel surface.</p>
</abstract>

We report on the preliminary phytochemical screening of the methanolic extract of the aerial parts of Lepidagathis alopecuroides and its evaluation as a potential corrosion inhibitor for mild steel in aerated 1.0 M HCl by weight loss and linear polarization measurements. Weight loss measurements were conducted at 303, 313, 323 and 333 K. The results showed that L. alopecuroides inhibited the corrosion of mild steel in the acid solution with inhibition efficiency increasing with increase in the concentrations of the plant extract but decreased with increase in temperature. Linear polarization plots showed the plant extract to inhibit both the dissolution of the steel at the anode and the hydrogen evolution reaction (HER) at the cathode making it a mixed inhibitor. Temkin adsorption isotherms best modeled the adsorption of L. alopecuroides extract on the steel surface. From the values of the evaluated kinetic activation parameters in the study, the mechanism of physisorption is proposed for the adsorption of the plant extract on the steel surface.

<italic>Lepidagathis alopecuroides</italic> methanol extract as corrosion inhibitor for mild steel in HCl

Ovidius University Annals of Chemistry

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

 methanol extract as corrosion inhibitor for mild steel in HCl

We report on the preliminary phytochemical screening of the methanolic extract of the aerial parts of Lepidagathis alopecuroides and its evaluation as a...

Lepidagathis alopecuroides methanol extract as corrosion inhibitor for mild steel in HCl

Published Online: Apr 03, 2021

Page range: 22 - 27

Received: Aug 28, 2020

Accepted: Jan 30, 2021

DOI: https://doi.org/10.2478/auoc-2021-0003

Keywords
mild steel, corrosion inhibitor, linear polarization, activation energy, adsorption isotherm

© 2021 Gloria I. Ndukwe et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Lepidagathis alopecuroides methanol extract as corrosion inhibitor for mild steel in HCl

Published Online: Apr 03, 2021

Page range: 22 - 27

Received: Aug 28, 2020

Accepted: Jan 30, 2021

DOI: https://doi.org/10.2478/auoc-2021-0003

Keywordsmild steel, corrosion inhibitor, linear polarization, activation energy, adsorption isotherm

© 2021 Gloria I. Ndukwe et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
mild steel, corrosion inhibitor, linear polarization, activation energy, adsorption isotherm