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Inhibitive Effect Ofl–Ohon The Corrosion Of Austenitic Chromium–Nickel Steel Inh2so4solution

Author

Listed:
  • S. M. A. HOSSEINI

    (Department of Chemistry, Shahid Bahonar University of Kerman, Kerman76169, Iran)

  • M. AMIRI

    (Department of Chemistry, Shahid Bahonar University of Kerman, Kerman76169, Iran)

  • A. MOMENI

    (Department of Chemistry, Shahid Bahonar University of Kerman, Kerman76169, Iran)

Abstract

The corrosion behavior of the austenitic chromium–nickel steel in different concentrations (0.001, 0.002, 0.005, and 0.01 M) of dimethyl 2-(2–hydroxy phenyl amino)-3-(triphenyl phosphoranilidin) butane dioate (L–OH) in 0.5 MH2SO4was investigated by potentiostatic polarization measurements. The effect of concentration and temperature on inhibition properties was determined. It was found that the presence ofL–OHreduces markedly the corrosion rate of steel in the acid solution. The inhibition efficiency increases as theL–OHconcentration is increased. Maximum inhibition efficiency (95%) was obtained for alloy in acid solution containing 0.01 M ofL–OH. Thermodynamic parameters for adsorption ofL–OHare calculated. It was found that the inhibitor is adsorbed on the steel surface and the experimental results are in agreement with Timken's isotherm. Negative values of the free energy of adsorption were obtained indicating the spontaneity of adsorption process. Scanning electron microscopy was done from the surface of exposed sample indicating uniform film on the surface of the alloy.

Suggested Citation

  • S. M. A. Hosseini & M. Amiri & A. Momeni, 2008. "Inhibitive Effect Ofl–Ohon The Corrosion Of Austenitic Chromium–Nickel Steel Inh2so4solution," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 15(04), pages 435-442.
    • Handle: RePEc:wsi:srlxxx:v:15:y:2008:i:04:n:s0218625x08011561
    DOI: 10.1142/S0218625X08011561
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