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Synergistic effect of colchicine and iodide ions on the corrosion of mild steel in 0.5 M H2SO4

Pavithra, MK and Venkatesha, TV and Kumar, Punith MK and Anantha, NS (2015) Synergistic effect of colchicine and iodide ions on the corrosion of mild steel in 0.5 M H2SO4. In: RESEARCH ON CHEMICAL INTERMEDIATES, 41 (8). pp. 5781-5796.

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Official URL: http://dx.doi.org/10.1007/s11164-014-1701-y

Abstract

The inhibition behavior of colchicine (CC) on the corrosion of mild steel in 0.5 M H2SO4 was evaluated by electrochemical methods such as potentiodynamic polarization and electrochemical impedance spectroscopic measurements. The inhibition efficiency increases with increasing concentration of CC. The potentiodynamic polarization results reveal that CC act as a mixed-type inhibitor by retarding both cathodic and anodic corrosion reactions. Additionally, the synergism was carried out between CC and KI to improve the corrosion inhibition behavior of CC on mild steel. The adsorption of both CC alone and the combined inhibitor (CC + KI) on mild steel surface follows Langmuir adsorption isotherm. The synergism parameter (S (theta) ) was calculated to recognize the existence of synergism between CC and iodide ions. Lastly, an adsorption mechanism of CC molecules with iodide ions is discussed.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Keywords: Mild steel; Acid corrosion; Inhibitor; Sulfuric acid; Synergistic effect
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 31 Jul 2015 14:40
Last Modified: 31 Jul 2015 14:40
URI: http://eprints.iisc.ac.in/id/eprint/51987

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