Safiyya Minjibir - Department of Chemistry, Faculty of Physical Sciences, Bayero University Kano, Kano, Nigeria
Magaji Ladan - Department of Chemistry, Faculty of Physical Sciences, Bayero University Kano, Kano, Nigeria

One cannot overstate the importance of looking for alternative solutions and effective corrosion control in our ecosystems. To investigate the corrosion inhibition behavior of ethanol extract of Prosopis juliflora leaves on mild steel in various concentrations of tetraoxosulphate VI acid (H۲SO۴) solution, electrochemical technique, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) were used in this research. The weight loss data showed that the highest inhibition effectiveness was seen at ۳۰۳K using ۱.۰g/L of the extract, while the lowest inhibition efficiency was shown at ۳۳۳K using ۰.۲g/L of the extract, which was seen to be ۱۲.۹۱%. Increased extract concentration improved efficacy and surface coverage; increased temperature and corrodent concentrations worsened these qualities. Corrosion activation energy increased along with the rise in inhibitor concentration. The inhibited and uninhibited systems had activation energies of ۵۰.۱۲۷, ۵۲.۵۹۱, ۵۳.۵۷۴, and ۵۴.۰۶۶ KJ mol-۱ and ۳۹.۸۷۹ KJ mol-۱ in the ۰.۵M H۲SO۴ system, respectively. The pattern is also the same in ۱.۰M H۲SO۴, and the negative ΔGads values suggest that the adsorption process is doable. A non-spontaneous process is suggested by negative ΔSads values, whereas an endothermic process is suggested by positive ΔHads values. According to the examined FTIR spectrum, the Prosopis juliflora ethanol extract was discovered to include the functional groups (O-H, COOH, N-H, N=O, C-O). A scanning electron microscope (SEM) analysis provided evidence of the extract's ability to preserve the metal surface. However, the Freundlch adsorption isotherm was best suited to handle the adsorption data. According to the results, the data from Gads indicated that the extract inhibition process was physisorption, which is why the values were less than ۴۰ KJ mol-۱. According to the study's findings, a different concentration of the corrodent should be used to measure the extract's level of inhibition on the surface of mild steel.

H۲SO۴, Inhibitor, Mild steel, Freundlch, Ethanol, Prosopis juliflora