Synthesis, characterization, efficiency evaluation of some novel triazole derivatives as acid corrosion inhibitors

In this study, a new series of triazole derivatives were synthesized via the regioselective click reaction. The target is to develop novel iron corrosion inhibitors. Experimentally, 4-nitro phenyl azide was prepared from 4-nitroaniline according to diazotization mechanism. Next, new triazole derivatives were synthesized by reactions of propargyl derivatives with 4-nitro phenyl azide by a cyclic addition 1,3-dipole mechanism and using click chemical method. All newly synthesized derivatives were characterized by FT-IR, 1H NMR and 13C NMR spectroscopy as well as elemental analysis (C, H, N). The corrosion inhibition efficiency of all newly synthesized derivatives in 2 M hydrochloric acid solution was evaluated on carbon steel by the weight loss method and polarization study. The test results showed that the compound 4-methyl-7-(2-(1-(4-nitrophenyl)-1H-1,2,3-triazol-4-yl)ethoxy)-coumarin 6d had the best inhibition efficiency (95%) against corrosion of carbon steel with a corrosion rate 17.972 mu m/y at 75 ppm in comparison to the other derivatives. The polarization study of derivative 6d disclosed that the nature of inhibitor activity was in agreement with the efficiency results obtained by the weight loss method.