Kinetic Studies of Corrosion of Mild Steel in Acidic Medium using Grewa venusta Leaves Extract as Inhibitor

Corrosion leads to huge loss of properties especially in the industries. The use of corrosion inhibitor is one way of preventing corrosion from occurring. The aim of this work was to investigate the kinetic and adsorption study of corrosion of mild steel in acidic medium using Grewa venusta leaves extract as an inhibitor. The experimental data from the work of Suleiman et al. were fitted into the developed kinetics corrosion process models with the aid of an in-built Software Excel version 7. The data were also fitted to the adsorption of corrosion process model to determine the isotherm model, which best fits the experimental data. The kinetics rate model had a negative fractional order (-0.5958) with a rate constant of 135.6394 h/m. The kinetic rate model validated the experimental data up to 94 percent confidence level. The first-order activity rate model developed fitted the experimental data up to 90 percent confidence level. The first-order activity rate constant obtained in the absence of inhibitor was 7.7459 h while it varied between 1.615 and 2.028 h in the presence of an inhibitor. Kinetic – Thermodynamic model with a constant of 0.7691 best fitted the experimental data. It is clear that the developed kinetics rate model and the first order activity model can be used to navigate the design of corrosion facilities of mild steel in 0.5 M tetraoxosulphate (VI) acid (H₂SO₄) using Grewa venusta leaves extract as an inhibitor.