Corrosion Inhibition of Mild Steel in Hydrochloric Acid by Lawsonia inermis and Hibiscus sabdariffa Extracts: A Comparative Study
Keywords:
AI-Assisted, Corrosion Inhibition, Lawsonia Inermis, Hibiscus Sabdariffa, Mild SteelAbstract
An assessment of comparative corrosion inhibition abilities of Lawsonia inermis (LI) and Hibiscus sabdariffa (HS) plant extracts for mild steel in hydrochloric acid media has been carried out. Weight-loss and potentiodynamic polarization methods were utilized to obtain the effectiveness of HS and LI to inhibit corrosion at 100mg/l to 3000 mg/l concentrations, for a period of 120 hours test on mild steel coupons Corrosion rates, inhibition efficiency, and surface coverage were determined, revealing significant inhibition by the plant extracts at optimal concentrations. Typical findings show Lawsonia inermis to have better inhibitor performance than Hibiscus sabdariffa as 95.7 mg/l and 95.0 mg/l for 0.1 M HCl and 97.8 mg/l and 96.5 mg/l for 1 M HCl respectively. Potentiodynamic polarization results revealed reduction of corrosion current density (Icorr) by 28.2 and 15.8 for HS and LI respectively in 0.1M HCl.
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