Probing the corrosion Inhibition Efficiency of Corn Cob Extract on Aluminium in 1.0 M H2SO4 descaling solution

Abstract

As the efforts towards green mitigation of corrosion are being intensified, the current research is aimed at probing the inhibition efficacy of corn cob extract on aluminium in 1.0 M H₂SO₄. The adsorbed inhibitor was subjected to weight loss, AAS and gasometric techniques to ascertain the inhibition performance. SEM was utilized to determine the surface morphology of the adsorbent(metal) before and after application of the adsorbate (corn cob extract). Three adsorption isotherm models were utilized to explain the reaction mechanism.The result obtained X-raysincreasing efficienciesat different concentrations(10%v/v-100%v/v)of the inhibitor for the various techniques used; weight loss: 68.79%, 71.50%, 73.85%, 79.92%, 85.48%, 86.04%, 86.80%, 89.61%, 89.81% and 92.22%; AAS:3.52%, 15.66%, 18.22%, 20.05%, 33.10%, 54.98%, 62.76%, 64.60%, 81.01% and 99.94%; and gasometric: 16.74%, 18.01%, 32.12%, 52.51%, 65.14%, 72.17%, 75.16%, 85.74% and 90.12%. SEM result shows that the surface morphology of the adsorbent was smoother in the presence of the inhibitor compared to the surface without it. The Langmuir and Temkin adsorption isotherm models revealed the reaction mechanism and chemisorption interaction of the inhibitor molecules.