Corrosion inhibition properties of pyrazolylindolenine compounds on copper surface in acidic media

Ebadi, M. and Ali, H.M. and Khaledi, H. and Basirun, Wan Jefrey (2012) Corrosion inhibition properties of pyrazolylindolenine compounds on copper surface in acidic media. Chemistry Central Journal, 6 (1). p. 163. ISSN 1752153X

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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[modifier letter right arrowhead] InPzTH [modifier letter right arrowhead] 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). Conclusion: 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.

Item Type: Article
Additional Information: Department of Chemistry, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Corrosion Inhibition, Inhibition Strength, Pyrazolylindolenine
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Dept of Chemistry
Depositing User: Miss Malisa Diana
Date Deposited: 25 Jul 2013 01:22
Last Modified: 30 Jan 2019 01:29
URI: http://eprints.um.edu.my/id/eprint/7535

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