J Mater Sci Technol ›› 2004, Vol. 20 ›› Issue (04): 463-466.

• Research Articles • Previous Articles     Next Articles

New Naturally Occurring Product Extract as Corrosion Inhibitor for 316 Stainless Steel in 5% HCl

T.Y.Soror   

  1. Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-07-28 Published:2009-10-10
  • Contact: T.Y.Soror

Abstract: Medipolymorphol, a new sterol isolated from the whole plant of Medicago polymorpha Roxb was used as corrosion inhibitor for 316 stainless steel in 5% HCl at room temperature. Electrochemical techniques have been found to be reliable in evaluating corrosion characteristics of the system. Several techniques have been used including Tafel, linear polarization, potentiodynamic polarization, and open circuit potential (OCP) studies. The additives simultaneously deaccelerated the anodic process, intensified the cathodic process and provided a stable passive state, giving good inhibition efficiencies to stainless steel electrodes. In addition, adsorption isotherm have been fitted for the inhibitor under investigation.

Key words: Medipolymorphol, Plant extract, Stainless steel, HCl, Corrosion inhibitor