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    Vol 1(1), 2014
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  • Know Res., 2014, 1(1),  pp 24-32  

    DOI:10.7598/kor2014.113

    Research Article

    Synergistic Inhibition Effect of Biosynthesized Silver Colloids on Purine Derivatives Inhibitors for Carbon Steel Acid Corrosion

  • W. Ahmed, Ahmed A. Farag, Ibrahim M. Nassar and Khalid Zakaria
  • Egyptian Petroleum Research Institute (EPRI), 1 Ahmed El-Zomor St., Nasr City, 11727, Cairo, Egypt
  • Abstract

    The improvement of two purine corrosion inhibitor behavior namely 1H-pyrazolo[3,4-d]pyrimidin-4(2H)-one (PU1) and 6-[(1-methyl-4-nitro-5-imidazolyl) sulfanyl] purine (PU2) by biosynthesis silver particles colloids (Ag?PC) were investigated. The Ag?PC was characterized by dynamic light scattering (DLS) and UV-visible spectroscopy. The corrosion inhibition of carbon steel in 0.5 mol dm-3 H2SO4 solutions was studied by electrochemical techniques. The potentiodynamic polarization curves indicated that PU1 and PU2 behave as mixed-type inhibitor. While in the presence of Ag?PC the PU1 and PU2 behave as cathodic inhibitor. There is a synergism between purine inhibitors and the biosynthesis Ag?PC, and the values of synergism parameter (S) are higher than unity.

    Keywords

    Carbon steel, silver particles, EIS, Polarization

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