Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 15 4 2022 10 01 3-Nitrobenzaldehyde-4-phenylthiosemicarbazone as Active Corrosion Inhibitor for Mild Steel in a Hydrochloric Acid Environment 285 293 81818 10.30509/pccc.2021.166869.1127 EN A.M. Mustafa Production Engineering and Metallurgy, University of Technology-Iraq, P.O. Box: 10001, Baghdad, Iraq Z. S. Abdullahe Production Engineering and Metallurgy, University of Technology-Iraq, P.O. Box: 10001, Baghdad, Iraq F. F. Sayyid Chemistry Department, Al-Mustansiriyah University, P.O. Box: 10001, Baghdad, Iraq M. M. Hanoon Production Engineering and Metallurgy, University of Technology-Iraq, P.O. Box: 10001, Baghdad, Iraq A. A. Al-Amiery Energy and Renewable Energies Technology Center, Technology- Iraq, P.O. Box: 10001, Baghdad, Iraq Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia W. N. R.W. Isahak Energy and Renewable Energies Technology Center, Technology- Iraq, P.O. Box: 10001, Baghdad, Iraq Journal Article 2021 07 26 <em>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.</em> https://pccc.icrc.ac.ir/article_81818_e931f64d79f8a73c57da2171c7836541.pdf