Synthesis, Characterisation and Corrosion Inhibition of Mild Steel by Butyltin(IV) 2-Acetylpyridine 4-Methyl-3-Thiosemicarbazone in HCl

Schiff base ligand, 2-acetylpyridine 4-methyl-3-thiosemicarbazone (Me-LH), and its organotin complex (BuSn(Me-LH)Cl2) were synthesized, characterized, subjected to corrosion inhibition study. The spectra crystal structure obtained revealed that the ligand is coordinated by pyridyl nitrogen, azomethine thiolate sulfur (IV) ion. Corrosion of synthesized compounds on mild steels in 1 M HCl solution at different concentrations tested using weight loss, Electrochemical Impedance Spectroscopy (EIS), potentiodynamic polarization, Scanning Electron Microscopy (SEM) adsorption analyses. results showed had a strong inhibitory effect comparison ligand. efficiency all techniques improved with an increase concentration inhibitor. Polarization analysis can be categorized as mixed-type inhibitors. Meanwhile, EIS study indicates inhibitor, resistance charge transfer increased. This resulted inhibitors development protective layer steel surface which was further confirmed SEM analysis. isotherm followed Langmuir model.
 HIGHLIGHTS
 
 efficient method inhibit rate acidic medium inhibitor
 electrochemical loss proved increases when inhibitor increased
 thiosemicarbazone potential low concentrations
 GRAPHICAL ABSTRACT