Corrosion Inhibition for Carbon Steel of Benzimidazole Derivatives Synthesized in Sulfuric Acid Solution

Synthesis three organic inhibitors for carbon steel corrosion 2- (propylthio) -1H-benzo [d]imidazole (PTBI), 2- (allylthio) -1H-benzo [d]imidazole (ATBI) and 2- (prop-2-ynylthio) -1H-benzo [d]imidazole (YTBI) were prepared from reaction of 2-mercapto benzimi-dazole with different alkyl halide. The melting point and TLC were used to confirm the purity of the inhibitors as well as using the [FTIR, 1H-NMR and 13C-NMR] for the identify structures. The synthesized inhibitors were examined by potentiostatic polarization measurement as corrosion inhibitors of carbon steel in acidic media [1M H2SO4]. The polarization measurement results showed that the mixed type inhibitors. In addition, the efficiency of inhibitors (YTBI) were studied at different concentration and temperature levels (308-338) K. the result, showed that the high conc. records high inhibition efficiency which ranged from (60-79 %).