Abstract
Extract of natural plants is one of the most important metallic corrosion inhibitors. They are readily available, nontoxic, environmentally friendly, biodegradable, highly efficient, and renewable. The present project focuses on the corrosion inhibition effects of Peganum Harmala leaf extract. The equivalent circuit with two time constants with film and charge transfer components gave the best fitting of impedance data. Extraction of active species by sonication proved to be an effective new method to extract the inhibitors. High percent inhibition efficacy IE% of 98% for 283.4 ppm solutions was attained using impedance spectroscopy EIS measurements. The values of charge transfer Rct increases while the double layer capacitance Cdl values decrease with increasing Harmal extract concentration. This indicates the formation of protective film. The polarization curves show that the Harmal extract acts as a cathodic-type inhibitor. It is found that the adsorption of Harmal molecules onto the steel surface followed Langmuir isotherm. Fourier-transform infrared spectroscopy FTIR was used to determine the electron-rich functional groups in Harmal extract, which contribute to corrosion inhibition effect. Scanning electron microscopy SEM measurement of a steel surface clearly proves the anticorrosion effect of Harmal leaves.
Highlights
Inhibition of corrosion of metals represents a major challenge in the industry
The efficacy of Harmal extract as an environmentally friendly inhibitor was demonstrated by investigating the electrochemical behavior of C-steel in solutions of
It was observed from the impedance plots that the charge transfer process mainly controls the corrosion of C-steel
Summary
Inhibition of corrosion of metals represents a major challenge in the industry. The main concern is to retard the extensive corrosion of different parts of oil production plants, tubing, and pipelines from the wellhead equipments. Inhibition of corrosion by adsorption inhibitors has been applied in different technologies such as acid pickling and descaling, petrochemicals, and storage of chemicals [3,4]. Many inorganic compounds such as chromium and manganese organic complexes were used as corrosion inhibitors in different media [5,6,7,8,9]. These low cost complexes were able to decrease efficiently the corrosion of different metals, such as Fe, Al, and Cu [9,10]
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