Enriched Neem Biodiesel With Piper Nigrum Ethyl Acetate Extract For Corrosion Inhibition Of Copper

Abstract

Neem biodiesel is enriched with antioxidant Piper nigrum ethyl acetate extract as a corrosion inhibitor for copper metal surface. The corrosion rate and corrosion inhibition efficiency at different acid values and temperature were evaluated and analysed. Notably, ASTM D130 evaluation reveals 98.0% corrosion inhibition efficiency in biodiesel. Impulsive adsorption of inhibitors on the metal surface was substantiated by negative free energy and heat of adsorption values. SEM surface morphological recordings were employed to study the surface changes of copper subjected for corrosion inhibition studies that revealed the protective nature of the inhibitor. Engine performance evaluations are found to be on par with the results of neem biodiesel alone and conventional diesel itself. Based on the above results, a new environmental-harmless corrosion inhibitor for copper corrosion in biodiesel is unearthed for practical purpose. Hence, this enriched biodiesel can be used as an alternative fuel that not only has good fuel value but also corrosion inhibition.