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Materials 2014, 7(8), 5711-5734; doi:10.3390/ma7085711

The Inhibition of Aluminum Corrosion in Sulfuric Acid by Poly(1-vinyl-3-alkyl-imidazolium Hexafluorophosphate)

1
Instituto Politécnico Nacional, ESIQIE, Departamento de Metalurgia y Materiales, Av. Instituto Politécnico Nacional S/N, Col. Lindavista, México D.F. 07300, Mexico
2
Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Av. San Claudio, Ciudad Universitaria. Col. San Manuel, Puebla, Puebla 72570, Mexico
3
Instituto Mexicano del Petróleo, Programa de Investigación y Posgrado, Eje Central Lázaro Cárdenas No. 152, Col. San Bartolo Atepehuacán, México D.F. 07730, Mexico
4
Instituto Politécnico Nacional, CIITEC, Cerrada Cecati S/N, Colonia Santa Catarina, Azcapotzalco, México D.F. 02250, Mexico
*
Author to whom correspondence should be addressed.
Received: 8 May 2014 / Revised: 23 July 2014 / Accepted: 29 July 2014 / Published: 7 August 2014
(This article belongs to the Special Issue Corrosion of Materials)
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Abstract

Compounds of poly(ionic liquid)s (PILs), derived from imidazole with different alkylic chain lengths located in the third position of the imidazolium ring (poly(1-vinyl-3-dodecyl-imidazolium) (PImC12), poly(1-vinyl-3-octylimidazolium) (PImC8) and poly(1-vinyl-3-butylimidazolium) (PImC4) hexafluorophosphate) were synthesized. These compounds were tested as corrosion inhibitors on aluminum alloy AA6061 in diluted sulfuric acid (0.1–1 M H2SO4) by weight loss tests, polarization resistance measurements and inductively coupled plasma optical emission spectroscopy. Langmuir’s isotherms suggested film formation on bare alloy while standard free energy indicated inhibition by a physisorption process. However, compound efficiencies as inhibitors ranked low (PImC12 > PImC8 > PImC4) to reach 61% for PImC12 in highly diluted acidic solution. Apparently, the high mobility of sulfates favored their adsorption in comparison to PILs. The surface film displayed general corrosion, and pitting occurred as a consequence of PILs’ partial inhibition along with a continuous dissolution of defective patchy film on formation. A slight improvement in efficiency was displayed by compounds having high molecular weight and a long alkyl chain, as a consequence of steric hindrance and PIL interactions. View Full-Text
Keywords: alloys; surfaces; corrosion test; electrochemical techniques; adsorption alloys; surfaces; corrosion test; electrochemical techniques; adsorption
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Arellanes-Lozada, P.; Olivares-Xometl, O.; Guzmán-Lucero, D.; Likhanova, N.V.; Domínguez-Aguilar, M.A.; Lijanova, I.V.; Arce-Estrada, E. The Inhibition of Aluminum Corrosion in Sulfuric Acid by Poly(1-vinyl-3-alkyl-imidazolium Hexafluorophosphate). Materials 2014, 7, 5711-5734.

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