Assessing The Potential of Caesalpinia Bonducella Leaf Ethanol Extract In 1M H2SO4 Solution For Corrosion Inhibition and Adsorption
DOI:
https://doi.org/10.51459/jostir.2025.1.1.04Keywords:
Caesalpinia bonducella, Corrosion, Mild Steel, Electrochemical, Gravimetric, InhibitionAbstract
The corrosion inhibition and adsorption properties of Caesalpinia bonducella leaf ethanol (CBLE) extract, a low-cost and sustainable corrosion inhibitor on low-carbon steel coupon in 1M H2SO4 solution were studied using weight loss and potentiodynamic polarization measurements. The surface morphology and the organic functional moieties of the extract were obtained from Scanning Electron Microscopy (SEM) and Fourier Transform Infrared spectroscopy (FTIR) data, respectively. The highest Inhibition efficiencies of 73.34% and 82.35% were obtained at 303K and 343K, respectively and at 0.8 g/L extract concentration. Corrosion inhibition occurred by the formation of CBLE extract adsorption films onto the coupon’s surface. The adsorption process can be best described by the Langmuir isotherm and chemisorption mechanism. Thermodynamic studies further showed that corrosion inhibition of the steel coupons in an acidic solution mediated by CBLE extract is endothermic and spontaneous. Electrochemical studies showed that the extract is adaptable in that it acts as a mixed-mode inhibitor with a prevalence of cathodic effectiveness.
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