UTILIZING THERMODYNAMIC PARAMETERS AND ISOTHERMS TO STUDY THE ADSORPTION OF OAK GALLS EXTRACT INHIBITOR ON THE CAST IRON SURFACE IN ATMOSPHERIC ENVIRONMENT
DOI:
https://doi.org/10.59743/jbs.v37i.338Keywords:
Carbon Steel, Corrosion, Oak Galls Extract, Adsorption Isotherm ModelsAbstract
An earlier study evaluated the effectiveness of Oak Galls Extract (OGE) as an environmentally friendly corrosion inhibitor of iron castings (iron artifacts) in the ambient atmosphere by measuring the weight loss of the treated coupons following being exposed to 85% humidity in a humidity chamber. Both optically and scanning electron microscopy were used to examine the surface morphology of an adsorbed inhibitor. By changing the inhibitor concentrations (2%, 4%, and 6% by weight of the solution), the inhibitory effect was taken into account. According to the measurement results, OGE exhibited an important level of inhibition, with an efficiency of almost 95% at 6% concentration. The investigation's results recommended OGE as a potent green inhibitor for cast iron (iron artifacts). In the current work, the adsorption of an OGE inhibitor on the surface of cast iron was studied. Many adsorption isotherms, such as Langmuir, Temkin, Freundlich, Adejo Ekwenchi, and El-Awady, were used in the adsorption experiment. The fact that the (OGE) inhibitor does not comply with the majority of the employed isotherm models suggests that its adsorption on cast iron surfaces is modest to poor. Conversely, (∆G°ads) demonstrated that physisorption was the inhibitor's mode of adsorption on the cast iron surface
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