Hydrogen sulfide corrosion inhibition of carbon steel has been evaluated using the combination of benzene-1,2-diamine, benzaldehyde, and FeCl3 to in situ inhibitor synthesis at 25°C using electrochemical and weight-loss studies. The results showed that the corrosion rate of steel decreased significantly by increasing the inhibitor concentration. The concentration of in situ synthesized inhibitor was measured by ultraviolet and visible spectrophotometer (UV-vis). The morphology and composition of the corrosion products were analyzed using scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS). Fourier transform infrared spectroscopy (FTIR) demonstrated the formation of 2-phenylbenzimidazole on the surface by an in situ manner. Quantum chemical studies were applied to investigate the correlation between the molecular structure and inhibition effect of this compound.

Subject
Hydrogen sulfide, Steel surfaces, Hydrogen concentration, Metal surfaces, Adsorption, Molecular structure, Fourier transform infrared spectrography, Chemical inhibition, Inhibition efficiency, Corrosion inhibitors, Carbon steel, Cathodic inhibitors, Anodic inhibitors
Keywords:
carbon steel, electrochemical investigations, Fourier transform infrared spectroscopy, hydrogen sulfide corrosion, inhibitor
© 2013 NACE International
2013
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