2025/06/26 by Benhlal, M., ouakki, moussa, Belhadj, O. +3
paper · doi:10.48317/imist.prsm/morjchem-v13i3.55064
The efficacy of Corchorus olitorius seed oil inhibitor "SCO" to protect against brass corrosion in chloridic acid was evaluated using chemical and electrochemical methods. The new Corchorus olitorius seed oil based green natural inhibitor "SCO" was used to inhibit brass corrosion in "HCl 1M" chloridic acid medium at concentrations ranging from 0.5 g/l to 2 g/l and at different temperatures ranging from 298 to 328 K. Extrapolation of the Tafel law from the polarization curve indicates that the inhibitory effect increases with the concentration of the SCO inhibitor. In addition, the "PC" polarization curves show that the new SCO natural product acts as a mixed inhibitor. At a concentration of 2 g/l, the inhibition efficiency reaches a maximum of 93.6%. Brass does not corrode as quickly in the presence of SCO as its concentration increases. On the other hand, for temperature variation, the inhibition efficiency was found to decrease with increasing temperature. Several thermodynamic parameters for the activation process and dissolution of brass in chlorodic acid "1M HCl" such as activation energy (Ea), activation entropy (ΔSa) and activation enthalpy (ΔHa) were also calculated and discussed. FT-IR showed that the acetone group formed an intrinsic layer on the brass surface, while scanning electron microscopy (SEM) demonstrated the absence of corrosion on the brass surface in the presence of SCO.