%0 Journal Article
%T Synergistic Effect of Potassium Iodide on Corrosion Inhibition of Mild Steel in HCl Medium by Extracts of Nypa FruticansĄŻ Wurmb
%A K Orubite-Okorosaye
%A IR Jack
%A M Ochei
%A O Akaranta
%J Journal of Applied Sciences and Environmental Management
%D 2007
%I University of Port Harcourt
%X The effect of Nypa fruticansĄŻ wurmb extract and the mixture of various concentration of KI and Nypa fruticansĄŻ wurmb extract on corrosion of mild steel in 0.1M and 0.5M HCl have been investigated using weight loss methods. The study revealed that mild steel is more efficiently inhibited by Nypa fruticansĄŻ wurmb in the presence of KI than pure extract of Nypa fruticansĄŻ wurmb. The inhibition efficiencies increased with increased concentration of the additives. The highest inhibition efficiency of 77.31% was observed with single Nypa fruticansĄŻ wurmb extract. An improved inhibition efficiency of 95.36% was observed with the mixture of Nypa fruticansĄŻ wurmb extract and KI at 30oC in 0.5M HCl. Inhibition efficiency decreased with increase in temperature from 30-40OC but increased at relatively high temperature of 50OC an effect attributed to synergism between Nypa fruticansĄŻ wurmb extract and KI. The adsorption of inhibitor molecules on metal surface followed langmuir isotherm. Thermodynamic parameters such as heat of adsorption,  H, free energy of adsorption  G and enthropy of adsorption are obtained from experimental temperatures ranging from 30 ¨C 50OC.
%U http://www.ajol.info/index.php/jasem/article/view/54980