title: Corrosion inhibition properties of pyrazolylindolenine compounds on copper surface in acidic media.
abstract: BACKGROUND
  The corrosion inhibition performance of pyrazolylindolenine compounds, namely 4-(3,3-dimethyl-3H-indol-2-yl)-pyrazole-1-carbothioamide (InPzTAm), 4-(3,3-dimethyl-3H-indol-2-yl)-1H-pyrazole-1-carbothiohydrazide (InPzTH) and 3,3-dimethyl-2-(1-phenyl-1H-pyrazol-4-yl)-3H-indole (InPzPh),) on copper in 1M HCl solution is investigated by electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) and linear scan voltammetry (LSV) techniques.
  
  
  RESULTS
  The results show that the corrosion rate of copper is diminished by the compounds with the inhibition strength in the order of: InPzTAm> InPzTH > InPzPh. The corrosion inhibition efficiencies for the three inhibitors are 94.0, 91.4 and 79.3, for InPzTAm, InPzTH and InPzPh respectively with the same inhibitor concentration (2 mM).
  
  
  CONCLUSIONS
  From the EIS, OCP and LSV results it was concluded that pyrazolylindolenine compounds with S-atom (with an amine group) have illustrated better corrosion inhibition performance compared to hydrazine and phenyl group.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia. mehdi_2222002@yahoo.com.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Ebadi
authors.forename: Wan Jeffrey
authors.initials: WJ
authors.lastname: Basirun
authors.forename: Hamid
authors.initials: H
authors.lastname: Khaledi
authors.forename: Hapipah Mohd
authors.initials: HM
authors.lastname: Ali