3-nitrobenzaldehyde-4-phenylthiosemicarbazone as active corrosion inhibitor for mild steel in a hydrochloric acid environment

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.