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Nicotine as Corrosion Inhibitor for 1018 Steel in 1M HCl under Turbulent Conditions
Araceli Espinoza-Vázquez*, Sergio Garcia-Galan and Francisco Javier Rodríguez-Gómez
Faculty of Chemistry, Department of Metallurgical Engineering, Universidad Nacional Autónoma de México, C.U., Distrito Federal, 04510, Mexico
- *Corresponding Author:
- Araceli Espinoza-Vázquez
Faculty of Chemistry
Department of Metallurgical Engineering
Universidad Nacional Autónoma de México
C.U., Distrito Federal, 04510, Mexico
Tel: 52-55-56225225
E-mail: arasv_21@yahoo.com.mx
Received date: August 26, 2015; Accepted date: September 30, 2015; Published date: October 07, 2015
Citation: Espinoza-Vázquez A, Garcia-Galan S, Rodríguez-Gómez FJ (2015) Nicotine as Corrosion Inhibitor for 1018 Steel in 1M HCl under Turbulent Conditions. J Anal Bioanal Tech 6:273. doi:10.4172/2155-9872.1000273
Copyright: © 2015 Espinoza-Vázquez A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Abstract
An electrochemical impedance technique for determining corrosion inhibition of nicotine in HCl on AISI 1018 steel under concentrations from 0 to 50 ppm found that the organic compound is a better corrosion inhibitor under static conditions. The inhibition efficiency (IE) increased with inhibitor concentration reaching an IE>90%, at 10 ppm. For [nicotine] ≤ 50 ppm, the IE value reached 71%, at 40 rpm, but diminished then to 33% upon changing the working electrode rotation speed to 500 rpm. The thermodynamic analysis showed a process ruled by physisorption according to the Langmuir adsorption model mechanism. Furthermore, the inhibition kinetics study showed that nicotine gave good protection against corrosion up to 72 hours of immersion with IE ≤ 87%. Finally, with increased temperature the IE values diminished from 90% at 25°C to 57% at 70°C, concluding that at high temperatures nicotine is ineffective at inhibition, because the temperature decrease, persistence layer easily desorbs.
