In situ inhibitor synthesis from admixture of benzaldehyde and benzene-1,2-diamine along with FeCl3 catalyst as a new corrosion inhibitor for mild steel in 0.5 M sulphuric acid

Corrosion protection of mild steel in 0.5 M H2SO4 solution was studied using combination of benzene-1,2-diamine and benzaldehyde with FeCl3 to in situ synthesis of new inhibitor at different temperatures employing electrochemical, weight loss, quantum chemical studies and optical microscopy. The electrochemical results represent the combination of these components in the solution shows equal efficiency to the compound which was synthesized in the laboratory which is 2-phenyl-1H-benzo[d]imidazole. To indicate this compound was created on the metal surface, deposited layer was investigated by Fourier transform infrared spectroscopy (FTIR). Optical microscopy examinations demonstrate a decrease in corrosion attacks in presence of inhibitors.

► Excellent inhibitive efficiency (97%) was obtained by in situ synthesis.
► Results from electrochemical and weight loss measurements are quite comparable.
► By increasing temperature the inhibition efficiency has not changed noticeably.
► FTIR results proved that 2-phenyl-1H-benzo[d]imidazole synthesized on the surface.
► Quantum chemical reveals benzene ring and N atoms are proper adsorption sites.