STUDY OF SYNERGISTIC INHIBITIVE PROPERTIES OF ETHANOLIC EXTRACTS OF CALATROPIS PROCERA ON THE CORROSION OF MILD STEEL IN HCl SOLUTION

Abstract

The of Calotropis procera leaves extract (CPLE) as corrosion inhibitor for mild steel in HCl solution was studied using the  thermometric technique. The percentage inhibition efficiency (%I) of the plant extract was found to increase with the increase in doses of the extract. Acid concentration was found to linearly affect the rate of corrosion in the mild steel sample used. Calotropis procera leaves extract showed maximum inhibition efficiency of 60.01% in 0.4M HCl. The effect of halide ions (I−) was also studied. The synergistic influence of iodide ions on the mild steel  corrosion inhibition performance of Calotropis procera leaves extract in 0.4M HCl led to an increased performance of the extracts to 96.92 %.