Comparative Studies Of Corrosion Inhibition Of Methanol Extract Of SennaOccidentalisOn Mild Steel In Sulphuric And Hydrochloric Acids

Abstract

The study of corrosion inhibition of sennaoccidentalismethanol extract on mild steel in 0.5M, 1M and 1.5M HCl and H2SO4was carried out by adsorption isotherm studies using gravimetric method. The corrosion rate of mild steel coupon in the plant extract was found to decrease with immersion time (2-6 hours) and with increase in concentration of inhibitor (400ppm-800ppm). The result further showed an increase in inhibition efficiency of the inhibitor up to 313k indicating an adsorption of extracts on the mild steel surface. The adsorption on mild steel was found to obey the Langmuir adsorption isotherm.