Study on corrosion behaviour of mild steel in presence of acidic medium using natural products as inhibitors

P. Matheswaran*, B. Anand, P.

Abstract

The efficiency of the inhibitor (IE) of an aqueous extract medium of L. Acidissima and Tridax Procumben.L (TPL)in controlling and preventing the mild steel material have been studied and investigated using weight loss measurement in the absence and presence of corrosion inhibitor in 1M HCL acidic medium at room temperature. Further the rate of Corrosion and efficiency were studied by EIS, potentiodynamic polarization and surface morphological techniques. Potentiodynamic polarization studies have revealed that the compound L.Acidissima and TPL behave as mixed-type inhibitors. Changes in impedance parameters shows the adsorption of the compound present in the inhibitor over the metal surface. These studies have also shown that L.Acidissima and TPL acts as a good inhibitor for preventing mild steel in 1 M HCl acid solutions at room temperature in 2 hrs. On comparing the two natural inhibitor the inhibition efficiency was high for TPL when compared to L.Acidissima.