Expired Temazepam as a Corrosion Inhibitor for Mild Steel in Acidic Medium: Insight from Chemical and Surface Probe Researches

Abstract

The influence of expired Temazepam drug on the corrosion of mild steel in 10 % HCl solution was studied with the help of weight loss, colorimetry and scanning electron microscopy studies. The studied inhibitor (Expired Temazepam) exhibits a protection efficiency of 96 % at 4 mg/L. The adsorption process is the backbone for the protection of mild steel from the aggressive 10 % HCl solution. Colorimetry studies reveal that, the examined expired drug effectively inhibits the weight loss of iron content in the mild steel with the help of a strong barrier layer, which is generated on the surface of mild steel. The barrier layer effectively isolates the mild steel surface from the 10 % HCl solution. Surface studies by scanning electron microscopy confirm that, expired Temazepam drug is a robust inhibitor for the corrosion of mild steel in the studied acid system.