Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Synthesis of ZnO-NPs Using Convolvulus Leaf Extract and Proving Its Efficiency as an Inhibitor for Carbon Steel Corrosion in 1M HCl

Version 1 : Received: 10 January 2020 / Approved: 12 January 2020 / Online: 12 January 2020 (13:53:53 CET)

A peer-reviewed article of this Preprint also exists.

Al-Senani, G.M. Synthesis of ZnO-NPs Using a Convolvulus arvensis Leaf Extract and Proving its Efficiency as an Inhibitor of Carbon Steel Corrosion. Materials 2020, 13, 890. Al-Senani, G.M. Synthesis of ZnO-NPs Using a Convolvulus arvensis Leaf Extract and Proving its Efficiency as an Inhibitor of Carbon Steel Corrosion. Materials 2020, 13, 890.

Journal reference: Materials 2020, 13, 890
DOI: 10.3390/ma13040890

Abstract

This paper studies the use of zinc oxide nanoparticles (ZnO-NPs) synthesized using an extract of convolvulus leaves and expired ZnCl2, as an efficient inhibitor for carbon steel corrosion in 1M HCl solution. ZnO-NPs are characterized by Fourier-transform infrared spectrophotometer (FTIR) and UV–Vis analysis. The technique of weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) has also been used to investigate the prevention of carbon steel corrosion in 1M HCl. The results showed that the efficiency of restraint increased when the concentration of ZnO-NPs was raised to 91% and that the inhibition efficiency is still high despite its decrease at high temperature, and it acts as a mixed-type inhibitor A sample of carbon steel with the protective inhibitor layer on top was immersed for 20 hours and observed; an increase in the charge transfer resistance (Rct) and stability of the inhibitor was noticed after 6 hours. Adsorption isotherm models demonstrated that the inhibitor adsorption mechanism on the carbon steel surface followed Langmuir, more than Freundlich and Temkin, behavior. The thermodynamic parameters showed that the adsorption process is a mixed adsorption, spontaneous, and exothermic. The results illustrated that the acid medium was a strong inhibitor of carbon steel corrosion. Scanning electron microscope (SEM) showed that the ZnO-NPs formed a good protective film on the carbon steel surface.

Subject Areas

ZnO-NPs; corrosion; synthesis; carbon steel; convolvulus; leaf; extract

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