SYNTHESIS, CHARACTERISATION AND EFFECT OF TEMPERATURE ON CORROSION INHIBITION BY THIOSEMICARBAZONE DERIVATIVES AND ITS TIN(IV) COMPLEXES

Thiosemicarbazone derivatives and its tin(IV) complexes used in this study were 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc), 2-acetylpyridine 4-methyl-3-thiosemicarbazone (HAcMTSc), 2-acetylpyridine 4-ethyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcETSc)PhenCl2), and 2-acetylpyridine 4-methyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcMTSc)PhenCl2). All these title compounds were characterised using an elemental analyser, Fourier-transform infraredattenuated total reflectance spectroscopy (FTIR-ATR), ultraviolet-visible spectroscopy (UV-Vis), and nuclear magnetic resonance (NMR). The efficiency of the synthesised compounds as a corrosion inhibitor of mild steel in 1.0 M HCl was investigated using weight loss technique at different concentrations, 1, 2, and 3 mM, and at a temperature range of 30–60 °C. The thiosemicarbazone ligand and its tin(IV) complexes affirmed the hypothesis where the inhibitor efficiency tends to increase as the inhibitor concentration increases, indicating their potential use as a corrosion inhibitor for mild steel. Moreover, inhibitor efficiency decreases when temperature increases.