Mitigation of Uniform and Electrochemical Corrosion of Aluminium in Acidic Medium by Sodium carboxymethyl Cellulose and Polyethylene Glycol

U.E. Itodoh¹ , I.C. Madufor² , M.U. Obidiegwu³ , E.E. Oguzie⁴

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.7 , pp.19-29, Jul-2021

Online published on Jul 31, 2021

Copyright © U.E. Itodoh, I.C. Madufor, M.U. Obidiegwu, E.E. Oguzie . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Mitigation of uniform and electrochemical corrosion of aluminium submerged into 1 M HCl solutions with as well as without sodium carboxymethyl cellulose (SCMC) and polyethylene glycol (PEG) was evaluated by gravimetric method and potentiodynamic polarization technique. Effects of immersion time, temperature, SCMC concentration and also possible synergistic inhibitory effect afforded by potassium iodide (KI) and PEG, respectively on SCMC were also studied. Gravimetric method showed that SCMC appreciably mitigated aluminium corrosion in the acid medium. Inhibitive performance of SCMC was attenuated alongside rise in temperature, but was improved on increasing concentration of SCMC. Effect of KI and PEG on SCMC was good and better, respectively in minimizing corrosion of aluminium submerged into 1 M HCl. Freundlich isotherm model was followed by the adsorptive mechanism of SCMC, SCMC-KI and SCMC-PEG, respectively on aluminium. The adverse effect of temperature on inhibitive performance of the compounds led to proposition of physisorption mechanism which was further substantiated by thermodynamic consideration. Polarization results revealed that both SCMC, SCMC-KI and SCMC-PEG functioned as mixed inhibitors with noteworthy mitigation of anodic reaction.

Key-Words / Index Term :
adsorption, aluminium, corrosion, inhibition, synergism

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