What is it about?
Developing environmentally friendly products is a modern science and an important task for today's chemistry and technology scholars. In the present research work, two new green chemical compounds, namely 1-benzoyl-6,6 dimethyl-2-phenyl-5,7 dioxaspiro[2.5]octane-4,8 dione (BMP) and 1-benzoyl-6,6-dimethyl-2-(4-nitrophenyl)-5,7-dioxaspiro[2.5]octane-4,8-dione (BMNP), have been synthesized and characterized. Their inhibition properties were investigated in hydrochloric acid solution (1.0 M HCl), for mild steel (MS) corrosion in different temperatures from 303 to 333 K, using, on the one hand, the experimental methods being electrochemical impedance spectroscopy, weight loss, as well as potentiodynamic polarization (PDP) techniques, and on the other hand, utilizing quantum chemical study, and Monte Carlo simulations. BMP and BMNP effect on the surface of MS have even been accentuated by scanning electron microscope. Experimental and theoretical results show that the two spirocyclopropane derivatives are good inhibitors in hydrochloric acid solution against the MS corrosion, and their inhibitory efficiencies (η%) are reaching values up to 91% and 95%, respectively, at a concentration of 10−3 M. BMNP is more effective than BMP owing to the NO2 grouping which has resulted in a clear augment in the propensity for corrosion inhibition. The PDP curves reveal that BMP and BMNP are mixed type inhibitors. Adsorption of inhibitors onto the steel surface was described well by Langmuir isotherm. To fully understand the mechanism of BMP and BMNP inhibition toward the MS surface in 1.0 M HCl solution, Monte Carlo simulations and density functional theory were carried out and discussed.
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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.
Dr Subrahmanya Bhat K
Manipal Institute Of Technology, Manipal Academy of Higher Education
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This page is a summary of: New spirocyclopropane derivatives: synthesis and evaluation of their performances toward corrosion inhibition of mild steel in acidic media, Research on Chemical Intermediates, April 2020, Springer Science + Business Media,
DOI: 10.1007/s11164-020-04108-9.
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