Corrosion inhibition studies of moringa oleifera lam extract on mild steel and copper in hydrochloric acid solution

I&EC 8

Sunday O. Ajeigbe, sunchem2002@yahoo.com, Department of Science Laboratory Technology, Federal Polytechnic, PMB 55, Bida, Niger, 921001, Nigeria, Evans C. Egwim, evansegwim@yahoo.com, Department of Biochemistry, Federal University of Technology, PMB 65, Bosso, Minna, 921001, Nigeria, and J. O. Okafor, Department oh Chemical Engineering, Federal University of Technology, PMB 65, Bosso, Minna, 921001, Nigeria.
Corrosion inhibition of crude extract of Moringa oleifera lam leaves extract was studied on mild steel and copper coupons in different concentrations of hydrochloric acid at the temperature range of 303 to 323K using weight loss techniques. Corrosion inhibition efficiency (CIE) on both metals increased with increasing concentration of the acid. However, temperature studies revealed a decrease in the CIE with increase in temperature. Kinetics and thermodynamic treatments of the results yielded activation energies, and other thermodynamic parameters, therefore, a physical adsorption mechanism is proposed for the inhibition process. The adsorption characteristics of the inhibitor were approximated by Freundlich isotherm. Corrosion inhibition using extract of Moringa oleifera lam is a promising alternative for synthetic organic corrosion inhibitors owing to its low toxicity, environmental acceptability, availability, renewability, effectiveness and potentially low cost.