Analytical and Bioanalytical Electrochemistry is an international scientific journal, which is published online every 3 months (since 2009), every 2 months (since 2011) and monthly (since 2018) by Center of Excellence in Electrochemistry, University of Tehran Analytical and Bioanalytical Electrochemistry - 14 4 2022 04 30 Corrosion Inhibition of Carbon Steel in 1 M HCl using Monopolar Surfactants Derived From 3-Methyl-1,2,4- Triazole-5-Thione 374 384 252039 EN Aithaddou Bouchaib Laboratory of Materials, electrochemistry and Environment (LMEE), Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000, Kénitra, Morocco 0000-0001-5736-8496 Said Elanza Laboratory of Organic Synthesis and Process of Extraction, Faculty of Sciences, University Ibn Tofail, Kénitra, Morocco Chebabe Driss Laboratory of Natural Substances & Synthesis and Molecular Dynamic, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, BP 509, Boutalamine, 52000 Errachidia, Morocco 0000-0002-1788-7942 Oubair Ahmad Laboratory of Materials Engineering for the Environment and Natural Ressources, Faculty of Sciences and Techniques, University of Moulay Ismail of Meknès, B.P 509, Boutalamine, 52000, Errachidia, Morocco Said Ibn Ahmed Laboratory of Materials, electrochemistry and Environment (LMEE), Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000, Kénitra, Morocco Journal Article 2021 07 23 In this work, we have synthesized the surfactant compounds derived from 2-(N-Alkyl-3-methyl-1,2,4-triazolthioyl) acetic acid (MTSACCn; n=10, n=11 and n=12). These compounds have been purified and identified using several spectroscopic methods such as ¹H NMR; ¹³C NMR spectroscopy. The molecular aggregation of MTSACCn has been foxed using tensiometer apparatus. The electrochemical study was carried out using a coupling of potentiodynamic and electrochemical impedance methods. The polarization curves indicate that the MTSACCn act as mixed-type inhibitors of carbon steel in 1M HCl solution. The electrochemical impedance spectroscopy measurements showed that all synthesized compounds act by establishing a barrier layer on the steel surface. Therefore, we noted that the inhibition efficiency increases with increasing of concentrations inhibitors. Also, the MTSACC12 is the best inhibitor, its inhibition efficiency reached a maximum value of 95% at 510^-4M. The adsorption of all surfactants studied follows the Langmuir isotherm. https://www.abechem.com/article_252039_bc057c59fc1c446261de750a738ad0f0.pdf