One-Pot Synthesis, Antibacterial Activity and Study the Inhibition Corrosion on Carbone Steel Alloy in Acid Media of 5-Phenyl-1,3,5-Dithiazinane & Cationic Surfactants.

Abstract

    This research involves synthesis of heterocyclic compounds (5-Phenyl-1,3,5-dithiazinane) by using one-pot method and cationic surfactants as quaternary ammonium salts (5-phenyl-5-tetradecyl-1,3,5-dithiazinan-5-ium bromide and N-tetradecylbenzenaminium bromide), which contains structural sulfur, nitrogen, and hydrocarbon tail in the molecule. The synthesized compounds were used as an inhibitor of corrosion in petroleum pipelines were used by the Basra Oil Company.

    The compounds (a, b, and c) were identified by FT – IR and ¹H NMR spectroscopies, GC – mass spectrometry. The antibacterial activity of the heterocyclic and surfactants compounds that were prepared was been evaluated against Escherichia coli and Staphylococcus epidermis.

       The influence of heterocyclic aromatic and surfactants as corrosion inhibitors on Carbon steel (C 95) in 2 M hydrochloric acid was studied by Tafel polarization technique. The results showed that the inhibition efficiency (% IE) of the prepared compounds (a, b, c) increased with increasing inhibitor concentrations and also with a decrease in temperatures.

The Tafel curves showd the high-efficiency inhibition for compound (b) that has the heterocyclic part and quaternary ammonium salt which enables this compound have a double anti-corrosion effect.