Synthesis and Study of Different Thioamides as Corrosion Inhibitors

Abdurrahman Abuabdalla Khalifa


Many organic compounds having electron rich atoms in their structures, such as nitrogen, and sulphur are widely use, in the petroleum industry to minimize corrosion. The presence of these atoms in the molecules increases its ability to form coordinate covalent bonds with the metal atoms, in the corrosion environment. Compounds based on fatty amines, aromatic amines, imidazolines, and fatty amides are now, uses as corrosion inhibitors. In this work some phenyl acetothioamide and benzyl acetothioamide are synthesized. Their corrosion inhibition characteristics have been measured in the artificial environment (10% crude in artificial brine and in sea water at PH 4.5 - 4.8). Prepared thioamides differs in their molecular weights, due to presence of different organic substituent's, on the thioamides group. The Synthesis of the compounds is based on the willgerodt-kindler reaction and confirmed by IR, UV-VS, DTA and other wet chemical analytical techniques. The experimental values of the elemental composition were compared with the calculated values and found agreeing. Uv-Vis. and I.R spectra show the absorption peaks, which confirms thioamides group. The possible reaction mechanism is discussed and the mechanism of corrosion inhibition in the corrosive environment was explained. The results was compared with the imported commercial inhibitors and found to be compatible.

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