What is it about?
The use of green and environmentally friendly substances is a contemporary scientific challenge and a key task for today's specialists in chemistry and technology-related fields. In this context, this research work involves the study of two new compounds named 1-benzoyl-2-(3,4-dimethoxyphenyl)-6,6-dimethyl-5,7-dioxaspiro [2.5]octane-4,8-dione (2-MPOD) and 1-benzoyl-6,6-dimethyl-2-(3,4,5-trimethoxyphenyl)-5,7-dioxaspiro [2.5]octane-4,8-dione (3-MPOD). The two compounds were synthesized and their inhibition properties for mild steel (MS) corrosion in 1.0 M HCl were first evaluated by means of experimental methods such as electrochemical impedance spectroscopy (EIS), weight loss (WL), in addition to potentiodynamic polarization (PDP) techniques, and also utilizing quantum chemistry studies and molecular dynamics (MD) simulations. For a description of the impact of molecules on the MS surface, the X-ray photoelectron spectroscopy (XPS) and scanning electron microscope equipped with an energy-dispersive spectrometer (SEM-EDS) have been performed. 2-MPOD and 3-MPOD were confirmed to be effective inhibitors in acidic solution and the highest resistance was achieved at 10-3 M concentration and 303K. The adsorption of inhibitors on MS has been linked to both physical and chemical processes. The adsorption is in accordance with the Langmuir isotherm model. Quantum mechanical calculation results suggest that π-electrons in the aromatic ring and the lone-pair electrons in the methoxy group contribute to enhanced adsorption onto iron surface, leading to effective corrosion inhibition.
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Perspectives
Corrosion of mild steel takes place in many environments especially during oil filed acidification process. One way to address this problem is by use of organic corrosion inhibitors. Our related publications: (i) H. Lgaz, K. S. Bhat, R. Salghi, Shubhalaxmi, S. Jodeh, M. Algarra, B. Hammouti, A. Essamri, Insights into corrosion inhibition behavior of three chalcone derivatives for mild steel in hydrochloric acid solution, J. Mol. Liq, Vol 238, 71-83, 2017. (ii) H. Lgaz, R. Salghi, K. S. Bhat, A. Chaouiki, Shubhalaxmi, S. Jodeh, Correlated Experimental and Theoretical Study on Inhibition Behavior of Novel Quinoline Derivatives for the Corrosion of Mild Steel in Hydrochloric Acid Solution, J. Mol. Liq., 244, 154-168, 2017. (iii) H. Lgaz, R. Salghi, A. Chaouiki, Shubhalaxmi, S. Jodeh, K. S. Bhat, Pyrazoline derivatives as possible Corrosion Inhibitors for Mild Steel in Acidic Media: A combined Experimental and Theoretical approach, Cogent Engg, 2018, Article id: 1441585 (17 pages). (iv) A. Chaouiki, H. Lgaz, Ill-Min Chung, I. H. Ali, S. L. Gaonkar, K. S. Bhat, R. Salghi, H. Oudda and M. I. Khan, Understanding Corrosion Inhibition of Mild Steel in Acid Medium by new benzonitriles: Insights from Experimental and Computational Studies, J Mol. Liq., 266, 603-616, 2018. (v) A. Chaouiki, H. Lgaz, R. Salghi, M. Chafiq, H. Oudda, Shubhalaxmi, K. S. Bhat, I. Cretescu, I. H. Ali, M. I. Khan, I-M. Chung, Assessing the Impact of Electron-Donating-Substituted Chalcones on Inhibition of Mild Steel Corrosion in HCl Solution: Experimental Results and Molecular level Insights, Coll. Sur. (A): Phy. Eng. Aspects. 588, 124366, 2020. (vi) H. Lgaz, S. K. Saha, A. Chaouiki, K. S. Bhat, R. Salghi, P. Banerjee, I. H. Ali, M. I. Khan, Ill-Min Chung, Exploring the potential role of pyrazoline derivatives in corrosion inhibition of mild steel in hydrochloric acid solution: Insights from experimental and computational studies, Const. Build. Mat., 2020, 233, 117320; (Scopus-Q1)
Dr Subrahmanya Bhat K
Manipal Institute Of Technology, Manipal Academy of Higher Education
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This page is a summary of: Inhibition performances of spirocyclopropane derivatives for mild steel protection in HCl, Materials Chemistry and Physics, December 2019, Elsevier,
DOI: 10.1016/j.matchemphys.2019.122582.
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