Experimental and Theoretical Investigation on the Corrosion Inhibitor Potential of N-MEH for Mild Steel in HCl

Document Type : Original Article

Authors

1 Ministry of Higher Education and Scientific Research, University of Technology, P.O. Box: 10001, Baghdad, Iraq

2 Production Engineering and Metallurgy, University of Technology, P.O. Box: 10001, Baghdad, Iraq

3 Department of Chemical and Process Engineering, Faculty of Engineering & Built Environment, University Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia

4 Technical College Al-Musaib, Al-Furat Al-Awsat Technical University, P.O. Box: 51006, Babil, Iraq

5 College of Dentistry, Al-Ameed University, P.O. Box: 1238, Karbalaa, Iraq

Abstract

There are significant losses at high costs for long periods due to the corrosion and damage it causes in most industrial processes, especially the oil and gas industries. The corrosion inhibition ability of N-methyl-2-(1-(5-methyl thiophene-2-yl) ethylidene) hydrazine carbothioamide (N-MEH) was examined. It was tested on mild steel in a 1 M hydrochloric acid solution. Gravimetric measurements and scanning electron microscopy (SEM) were used to confirm the effort compound as a corrosion inhibitor. The experimental results showed that the maximum inhibition efficacy of 95.3 % was performed at an optimal inhibitory concentration of 0.005 M and 303 K using weight loss techniques. SEM indicates that N-MEH molecules are absorbed onto the surface of mild steel. As a complementary technique, density functional theory (DFT) was used to look at the interactions between N-MEH molecules and mild steel surfaces. N-MEH molecules' adsorption on the surface of mild steel follows the processes of chemical and physical absorptions and obeys the Langmuir isothermal adsorption model.

Keywords

Main Subjects

References

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