Corrosion inhibition performance of citrullus colocynthis seed oil extract as a mild steel in 1.0 M HCl acid using various solvants such as petroleum ether (CSOP) and cyclohexan (CSOC) polymerics

• Published in: Inorganic chemistry communications 2023-09, Vol.155, p.111042, Article 111042
• Main Authors: Doumane, Ghizlane, Bensalah, Jaouad, Hmada, Abdelfettah, Iraqi, Oumayma, Boussalem, Oussama, Mhanni, Dounia, Rifi, El Housseine, Safi, Zaki S., Zarrouk, Abdelkader, Dkhireche, Nadia, Habsaoui, Amar
• Format: Article
• Language: English
• Subjects: Citrullus Colocynthis Seed Oil Extract; DFT; Mild steel corrosion; PDP/EIS; SEM/EDX
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2023.111042

[Display omitted] •The efficiency highest to reach a value maximum of 95. 82 % at 1.5 g/L of the CSOP and 97.35% at 1.5 g/L of the CSOC.•SEM and EDX studies support the formation of inhibitors film on steel surface.•The thermodynamic experiment data of activation are obtained.•Theoretical and experimental results are in good agreement.•Palmitic acid ranged between 6.28 % (CSOP) and 7.47 % (CSOC), while oleic acid contents were 21.44 % (CSOP), and linoleic acid contents ranged from 68.98 % (CSOP) to 86.22 % (CSOC). The inhibitory effect investigation of petroleum ether (CSOP) and cyclohexan (CSOC) ofSeed oil extract Citrullus colocynthis on mild steel (MD) corrosion in 1 M HCl solutions has been evaluated. The greasy composition acid of Citrullus colocynthus seed oil was determined in this study. Palmitic acid ranged between 6.28 % (CSOP) and 7.47 % (CSOC), while oleic acid contents were 21.44 % (CSOP), and linoleic acid contents ranged from 68.98 % (CSOP) to 86.22 % (CSOC). Various electrochemical techniques were used such as weight loss measurements, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in order to advance in the inhibition process. The action inhibiting present augmented with the concentration of the inhibitor tested. The efficiency highest to reach a value maximum of 95.8 % at 1.5 g/L of the CSOP and 97.4 % at 1.5 g/L of the CSOC. The inhibition efficiency of each inhibitor increases sharply with increasing concentration and a decreasing of efficiency was observed with increasing temperature for both inhibitors. Bothinhibitorswere seen to act as a mixed type inhibitors from PDP study and according to EIS technical, their corrosion process is transfer charge controlled. Thermodynamic and activation parameters were determined to discuss the inhibitory behaviour of CSOP and CSOC molecules. Morphology of the metal specimen surface without and with inhibitors was investigated using Scanning electron microscopy (SEM) andEDXspectrum. The electronic characteristics of major compounds ofCSOC and CSOP were studied using the DFT method (density functional theory) and the Fukui indices in order to predict the the adsorption mechanism of these compounds on the mild steel surface.