Experimental and theoretical study on the corrosion inhibition of mild steel by nonanedioic acid derivative in hydrochloric acid solution

Ahmed A Al-Amiery; Abu Bakar Mohamad; Abdul Amir H Kadhum; Lina M Shaker; Wan Nor Roslam Wan Isahak; Mohd S Takriff

doi:10.1038/s41598-022-08146-8

Experimental and theoretical study on the corrosion inhibition of mild steel by nonanedioic acid derivative in hydrochloric acid solution

Sci Rep. 2022 Mar 18;12(1):4705. doi: 10.1038/s41598-022-08146-8.

Authors

Ahmed A Al-Amiery^{1

2}, Abu Bakar Mohamad³, Abdul Amir H Kadhum⁴, Lina M Shaker³, Wan Nor Roslam Wan Isahak³, Mohd S Takriff^{3

5}

Affiliations

¹ Renewable Energies and Technology Energy Center, University of Technology-Iraq, Baghdad, 10001, Iraq. dr.ahmed1975@ukm.edu.my.
² Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia. dr.ahmed1975@ukm.edu.my.
³ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
⁴ University of Al-Ameed, Karbala, Iraq.
⁵ Chemical and Water Desalination Engineering Program, Department of Mechanical and Nuclear Engineering, Collage of Engineering, University of Sharjah, 26666, Sharjah, United Arab Emirates.

Abstract

The corrosion performance of mild steel (MS) in 1M HCl solution was examined by weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), and open circuit potential (OCP) measurements in the absence and presence of nonanedihydrazide. PDP measurements indicated that nonanedihydrazide acts as a mixed inhibitor due to its adsorption on the MS surface, exhibiting an inhibition efficiency of more than 97%. The surface morphology investigation of the protective layer on the MS surface confirmed that adsorption of nonanedihydrazide molecules occurred via chemical adsorption following Langmuir's isotherm model. The effect of temperature on the corrosion performance in the presence of nonanedihydrazide was investigated in the range of 303-333 K, showing that the inhibition efficiency increased with an increase in the inhibitor concentration and decreased with an increase in temperature. A new green corrosion inhibitor was synthesised and theoretical computations were conducted to completely understand the inhibition mechanism. Nonanedihydrazide molecules were investigated by DFT (density functional theory) using the B3LYP functional to evaluate the relationship of corrosion inhibition performance and the molecular structure. The computed theoretical parameters presented significant support for understanding the inhibitive mechanism revealed by the inhibitory molecules and are in good agreement with WL, PDP, EIS, (EFM), and OCP results.