2024/02/28 by Hailam, B., Galai, M., Chebabe, D. +6
paper · doi:10.48317/imist.prsm/morjchem-v12i2.45945
Mild steel is a common material and has found widespread use in many industries. However, its ability to corrode in aggressive environments limits its application. This study aims to study mild steel corrosion inhibition in 5.0 M HCl using Zn (II) complexes (C3), based on N1,N2-bis(2-nitrobenzylidene)ethane-1,2-diamine (L2). Measurements of electrochemical techniques, such as polarization plots and Electrochemical Impedance Spectroscopy (EIS) were used to study their behavior. Polarization plots revealed that these inhibitors are mixed type. The inhibition efficiency increases with increasing inhibitors concentrations. The impedance diagrams show that the charge transfer resistance increase in the presence of inhibitors and the value of double layer capacity decrease. The inhibition efficiency reaches 90% for 5.10-4M of C3. This result in good agreement that inhibitors studied act by forming an inhibitor film on steel surface. The surface of the steel before and after corrosion was characterized by the Scanning Electron Microscope coupled with Dispersive Energy Analysis (SEM-EDAX), The results of electrochemical studie and the surface analysis of the steel show that these the complexe is effective for the protection of steel in 5.0 M HCl, in addition, this complexe is adsorbed to the steel surface following the isotherm of Langmuir.