3-Nitrobenzaldehyde-4-phenylthiosemicarbazone as Active Corrosion Inhibitor for Mild Steel in a Hydrochloric Acid Environment

Document Type : Original Article

Authors

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

2 Chemistry Department, Al-Mustansiriyah University, P.O. Box: 10001, Baghdad, Iraq

3 Energy and Renewable Energies Technology Center, Technology- Iraq, P.O. Box: 10001, Baghdad, Iraq

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

Abstract

Natural and synthetic organic compounds were used as corrosion inhibitors to produce coordination complexes with metallic surface utilizing the active sites. These metallic complexes occupy a significant surface area on the metallic surface, therefore coating the metallic surface and shielding the metallic surface from acidic solutions. In the current study, a new Schiff base, namely (3-nitrobenzaldehyde)-4-phenylthiosemicarbazone (3N-4P), was designed and synthesized. The chemical structure of 3N-4P was determined using spectroscopic methods such as infrared (IR) and proton and carbon-13 nuclear magnetic resonance (1H and 13C-NMR) and CHN-analysis. The corrosive inhibitory potential of the 3N-4P was tested on mild steel (MS) coupons in a 1 M HCl utilizing weight loss techniques. The inhibitive efficiency (IE%) of 3N-4P increased with 3N-4P concentration increases and decreased with increasing temperature. The experimental findings revealed that 3N-4P molecules obeyed the Langmuir adsorption isotherm. Scanning by electron microscope (SEM) technology measured the uninhibited and inhibited coupon surface.

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Main Subjects


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