The inhibition effects of some cyclic nitrogen compounds on the corrosion of the steel in NaCl mediums


Sahin M., Bilgic S., Yilmaz H.

APPLIED SURFACE SCIENCE, vol.195, pp.1-7, 2002 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 195
  • Publication Date: 2002
  • Doi Number: 10.1016/s0169-4332(01)00783-8
  • Title of Journal : APPLIED SURFACE SCIENCE
  • Page Numbers: pp.1-7

Abstract

Corrosion inhibition efficiencies of 3-amino-1,2,4-triazole (3-ATA), 2-amino-1,3,4-thiadiazole (2-ATDA), 5-(p-tolyl)-1,3,4-triazole (TTA), 3-amino-5-methylmercapto-1,2,4-triazole (3-AMTA) and 2-aminobenzimidazole (2-ABA) on steel in sodium chloride media were investigated using Tafel extrapolation method. Potentiostatic current-potential curves were utilized to derive corrosion potentials (E-corr), corrosion current densities (i(corr)), surface coverage degrees (theta) and corrosion inhibition efficiencies (eta, %). 2-ABA was found to have the highest inhibition efficiency in both, 2.5 and 3.5% aqueous NaCl media. For all the inhibitors studied, surface coverage and inhibition efficiency values were found to increase with increasing concentration of the compound concerned. Inspection of the theta values indicate that the adsorption process obeys the Temkin isotherm for TTA and 2-ABA, but the Langmuir isotherm is followed by 3-ATA, 2-ATDA and 3-AMTA. (C) 2002 Elsevier Science B.V All rights reserved.