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

Chemistry Central Journal

Mehdi Ebadi³  Wan Jeffrey Basirun²  Hamid Khaledi¹  Hapipah Mohd Ali¹ 

[1] Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia

[2] Nanotechnology & catalysis research centre, Institute of postgraduate studies, University of Malaya, 50603, Kuala Lumpur, Malaysia

[3] Department of Chemistry, Faculty of Science, Islamic Azad University- Gorgan Branch, Gorgan, Iran

关键词: Acid inhibition;    FESEM;    Electro-corrosion;    Copper;    Corrosion behaviour;   

Others  :  787992
DOI  :  10.1186/1752-153X-6-163

 received in 2012-08-26, accepted in 2012-12-18,  发布年份 2012

【 摘 要 】

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).

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.

【 授权许可】

   
2012 Ebadi et al.; licensee Chemistry Central Ltd.

【 图 表 】

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Scheme 1

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