ISSN 2305-6894

Exploration of 8-piperazine-1-ylmethylumbelliferone for application as a corrosion inhibitor for mild steel in hydrochloric acid solution

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1 Production engineering and metallurgy department, University of Technology – Iraq, Baghdad, Iraq
2 Energy and renewable energies technology center, University of Technology – Iraq, Baghdad, Iraq
3 Laser & optoelectronics engineering department, University of Technology – Iraq, Baghdad, Iraq
4 Al-Mussaib Technical College, Al-Furat Al-Awsat Technical University, 51006 Babylon, Iraq
5 College of Medicine, University of Al-Ameed, Karbala, Iraq
6 Department of Chemical Engineering, Faculty of Engineering and Build Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia

Abstract: The name umbelliferone is from the Umbelliferae plants family, which in turn is named after the umbrella-shaped inflorescences, each of which is called an umbel. It was found in carrot, coriander, and garden angelica, mouse-ear hawkweed, and bigleaf hydrangea. In this study, a new umbelliferone derivative, namely 8-piperazine-1-ylmethylumbelliferone (8P), was synthesized, and its structure was characterized and confirmed by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The potential of using 8P as an eco-friendly corrosion inhibitor for mild steel in hydrochloric acid solution was examined using gravimetric techniques confirmed by topology characterization through scanning electron microscopy technique. The effect of inhibitor concentration, solution temperature, and immersion time on the inhibition efficiency of 8P was also investigated. The results from weight loss techniques reveal that 8P exhibits significant anti-corrosive characteristics toward mild steel dissolution in 1 M hydrochloric acid environment. 8P with a concentration of 0.0005 M exhibited the highest inhibition efficiency of 93.42% at 303 K. Scanning electron microscopy exhibited that 8P inhibited mild steel corrosion. The adsorption isotherm indicated that 8P exhibited physical and chemical sorption mechanisms and obeyed the Langmuir adsorption isotherm model. The relationship between the inhibition behavior of the 8P and its molecular structure was examined by density functional theory (DFT) which confirmed that 8P possessed significant inhibition efficiency which was consistent with experimental findings.

Keywords: 8-piperazine-1-ylmethylumbelliferone, corrosion, DFT, HOMO, Langmuir isotherm

Int. J. Corros. Scale Inhib., , 10, no. 1, 368-387 PDF (747 K)
doi: 10.17675/2305-6894-2021-10-1-21

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