Abstract
The objective of our work is to evaluate the synergistic effect of the essential oil of Allium Sativum and diethylthiourea to inhibit the corrosion of carbon steel against an aggressive medium of 0.5 M sulfuric acid. After extraction and identification of the essential oil by gas chromatography coupled to mass spectrometry (GC MS), a study was carried out by different electrochemical techniques (impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and surface analysis by scanning electron microscopy associated with X-ray Dispersive Energy microanalysis (SEM/EDX). The polarization curves indicate that the mixture used acts as an excellent inhibitor significantly slowing down the corrosion rate. The results obtained show that the inhibiting efficiency depends on the concentration of the compound as well as the temperature used. It reached 98.11% at a concentration of 1.5 g/l of DT alone, and it overcomes to 99.19% when adding 1 g/l of the essential oil of Allium Sativum. Other thermodynamic parameters of the activation process and metal dissolution are also calculated and discussed.
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Mzioud, K. et al. (2022). Synergistic Effect from Allium Sativum Essential Oil and Diethylthiourea for Corrosion Inhibition of Carbon Steel in 0.5 M H2SO4 Medium. In: Vaseashta, A., Achour, M.E., Mabrouki, M., Fasquelle, D., Tachafine, A. (eds) Proceedings of the Sixth International Symposium on Dielectric Materials and Applications (ISyDMA’6). Springer, Cham. https://doi.org/10.1007/978-3-031-11397-0_23
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