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  • Chem Sci Trans., 2014, 3(1),  pp 221-231  

    DOI:10.7598/cst2014.688

    Research Article

    Corrosion Inhibition of Mild Steel in Acidic Medium by Salvadora Persica (Miswak) Part 1: in Sulfamic Acid

  • HESHAM T.M. ABDEL-FATAH, ALIAA A. M. HASSAN, ZAKI A. SAADI,
    MAISON M. SHETIFY and HALA E.E. EL-SEHIETY
  • Department of Corrosion Research, Central Chemical Laboratories, EEHC, Sabtia, Cairo, Egypt
    Department of Chemical Engineering,Higher Technological Institute, Tenth of Ramadan City, Egypt
    Faculty of Science and Arts in Al-Ardha, Jazan University, Al-Ardha, Jazan, Saudi Arabia
    Department of Chemistry Laboratory, Psychiatric Hospital, Jazan, Saudi Arabia
  • Abstract

    Aqueous root extract of Salvadora persica (ARESP) was studied as a new green corrosion inhibitor for mild steel (MS) in 1.0 N sulfamic acid solutions by using mass loss and electrochemical techniques at temperatures ranging from 303 to 333 K. Appropriate equivalent circuit model was used to calculate the impedance parameters. The electrochemical impedance spectroscopy (EIS) measurements showed that the charge transfer resistance increases with an increase in the concentration of ARESP. The results obtained from the new technique electrochemical frequency modulation (EFM) indicated that ARESP acts as mixed type of inhibitor. The protection efficiency increases with the increase in inhibitor concentration and decreases with temperature. The results of the study revealed that ARESP inhibits the corrosion of MS through adsorption process following Temkin adsorption isotherm model. The apparent activation energy (Ea) and the equilibrium constant of adsorption (Kads) were calculated. Scanning electron microscopy (SEM) was used to investigate the adsorbed film of ARESP on the steel surface.

    Keywords

    Acid cleaning, Sulfamic acid, Corrosion inhibition, Mass loss, EIS, EFM

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