Application and Theoretical Study: New Barbiturate Derivatives as Corrosion Inhibitors

Ali, Kadhim A.; Kareem, Mohanad M.; Salman, Hamida I.

doi:10.21608/eajbsc.2023.327190

Application and Theoretical Study: New Barbiturate Derivatives as Corrosion Inhibitors

Document Type : Original Article

Authors

¹ Department of Chemistry, College of Education for Pure Sciences, University of Karbala, Karbala, Iraq.

² Department of Chemistry, College of Science, University of Babylon, P.O. Box 51002, Hilla, Iraq.

10.21608/eajbsc.2023.327190

Abstract

The study's focus is on the use of potentiostat technology to stop the corrosion of mild steel alloys using various barbiturates which are newly prepared compounds. It has been synthesized and described by 13C, FTIR, and 1HNMR techniques at concentrations ranging from 0 to 200 ppm in a 1M sulfuric acid solution at temperatures between 303 and 323 K. Anode and cathode curves (a, c), corrosion current density (Icorr), corrosion potential (Ecorr), and efficiency inhibition ratio (E%) were used in the experiments, and the results were presented.DFT calculations have been performed to understand the nature of the interactions between the inhibitor molecules and the surface of the alloy to be tested.
The influence of temperature and concentration on the effectiveness of inhibition was examined. The prepared compound used as an inhibitor is effective and a good corrosion inhibitor in mild steel alloy under the experimental conditions used, where the highest inhibition efficiency was 85.30% at a rising temperature and increasing inhibitor concentration, according to the results. 200ppm concentration at 323K in temperature. were also examined and talked about. it was found that the adsorption of the two compounds obeys Langmuir, which elaborated the thermodynamic functions of the adsorption operation (ΔSads, ΔHads, ΔGads).

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