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Hibiscus leaves extract: A green corrosion inhibitor
Author : Kalyani Y. Gaidhani a, Pratiksha D. Khurpade b and Somnath Nandi *a
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ABSTRACT
Corrosion is of great concern for chemical and process industries. Environment friendly corrosion inhibitors are need of hour in order to reduce toxic footprint and to achieve sustainable and green processes. The study reported here is a systematic experimentation conducted to examine the efficiency of Hibiscus leaves extracts as a potential green inhibitor for mild steel under acidic medium. High inhibition efficiency of almost 89% reported for 1 day protection at room temperature which gradually reduces to 80% in 4 days. The mechanism of inhibitive action was analysed to be physical adsorption and the Langmuir adsorption isotherm fitted well to the experimental data. The equilibrium adsorption constant (Kads) and standard free energy (ΔGº) evaluated for the system are in good agreement with the published values for green inhibitors.
KEYWORD
Corrosion inhibitor, green processes, Hibiscus leaves extract, adsorption, langmuir isotherm