Protective Effects of Expired Abarelix Drug As a Non-Toxic Corrosion Inhibitor for Mild Steel in 3 M HCl Solution

摘要

The corrosion inhibition efficiency of expired Abarelix drug on the surface of the mild steel (MS)in 3 M HCl media was examined by weight loss, gasometric, atomic absorption spectroscopy,potentiodynamic polarization and AC impedance techniques. Gravimetric (weight loss) resultsshowed that, protection efficiency is directly related to the expired Abarelix drug concentrationand inversely proportional to the immersion time. Adsorption of expired Abarelix drug species onthe mild steel in acid media was confirmed by gasometric, and atomic absorption spectroscopytechniques. Further, the decrease in corrosion current density value with an increase in the amountof expired Abarelix drug is an indication of corrosion inhibiting action of the expired Abarelixdrug on the metal surface in acid system. Nyquist plots clearly indicate the inhibition role ofexpired Abarelix drug on the metal surface. Surface (scanning electron microscopy SEM)technique also showed that, morphology observed in protected MS system is different from theunprotected system.