Research on Corrosion Inhibition Performance of 1,2 - Diphenyl - 1H - Imidazo [4,5 - f][1,10] Phenanthroline as a New - Type Inhibitor for Mild Steel

In order to improve the corrosion inhibition performance and the application scope of o - phenanthroline derivatives, a new type of 1,2 - diphenyl - 1H - imidazo [4,5 - f][1,10] phenanthroline (HIP) corrosion inhibitor was synthesized by molecular design method. The corrosion inhibition effect on mild steel in hydrochloric acid medium and the adsorption behavior on the surface of mild steel were studied through weightlessness method, electrochemical method and scanning electron microscope. In addition, the adsorption thermodynamics of corrosion inhibitor molecules were analyzed, and the relationship between the molecular structure of HIP and corrosion inhibition performance was further studied by quantum chemical method. Results showed that HIP had good corrosion inhibition performance for mild steel in 1.0 mol/L HCl solution, and the corrosion inhibition efficiency was 97.0% under the temperature of 40 ℃ with the inhibitor concentration of 1.0 mmol/L. Moreover, the adsorption of HIP on the surface of mild s