Alleviation of Boiler Corrosion during Acid Pickle 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.8 , Issue.3 , pp.1-11, Sep-2021

Online published on Sep 30, 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 :
Boilers are commonly used in water treatment facilities for heating operations. However, they are severely attacked by carbonic acid thus requiring acid cleaning. Acid cleaning is one of the maintenance operations done to ensure extension of boilers shelf life, promote operational efficiency and reduce cost of maintenance. Given thermal conductivity of aluminium, it is used for boiler manufacture. Hence, it became pertinent to study alleviation of boiler corrosion during acid pickle by sodium carboxymethyl cellulose (SCMC) and polyethylene glycol (PEG) using weight loss measurement along with potentiodynamic polarization measurement. Influence of potassium iodide (KI) on SCMC was also studied. Findings showed that aluminium corrosion was minimized as inhibition efficiency stood at 96.43% after 1-day exposure to 2 g SCMC+PEG/L of 0.5 M HCl at 30 ?C while 82.14% and 91.07% were obtained by 2 g SCMC and 2 g SCMC+KI, respectively within 1 L of 0.5 M HCl at 30 ?C. Increasing thermal influence as well as immersion period reduced inhibition efficiency while increasing content of the compounds ameliorated inhibition efficiency. Inhibitory performance demonstrated by the compounds was afforded owing to molecular adsorption of the compounds which followed Freundlich isotherm model on the aluminium surface. Thermodynamic considerations led to proposition of physisorption mechanism. Polarization study conveyed that all the inhibitive compounds exhibited mixed inhibitory behaviour alongside predominant dampening of anodic dissolution of aluminium under the studied conditions. Anticorrosive performance of SCMC, SCMC+KI and SCMC+PEG was dependent on temperature of the medium, immersion period, compounds content and possible synergism.

Key-Words / Index Term :
Adsorption, Aluminium, Corrosion Inhibition, Synergism, Sodium carboxymethyl Cellulose, Polyethylene Glycol, Weight loss, Polarization

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