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International Journal of Basic Science and Technology

A publication of the Faculty of Science, Federal University Otuoke, Bayelsa State

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Archive | ISSUE: , Volume: Oct-Dec-2023

Polarization Corrosion Effects of Nanocellulose Reinforced Zinc Magnesium Oxide Coatings on A36 Steel in Acidic Media


Author:Anyanwu et al., 2022

published date:2023-Jul-13

FULL TEXT in - | page 168 - 177

Abstract

Adverse corrosion effects of A36 steel has become an interminable cause of concern when employed in construction applications. The steel is generally applied in diverse construction application as a result of its comparatively good mechanical properties, availability and cost effectiveness. This research was aimed at studying the polarization corrosion effects of nanocellulose reinforced zinc- magnesium oxide (Zn-MgO-xCn) composite coatings on locally sourced A36 steel in acidic media. The corrosion rates of the deposited coatings were determined via potentio-dynamic polarization method in 1M solution of hydrochloric acid. The surface morphology and phase evolution of the composite coatings were determined by optical microscopy and x-ray diffractometry, respectively. Results from the study showed that the deposited composite coatings presented lower corrosion rate values than that of the as received A36 steel sample, whose values was 5.3243 mm/y. Sample Zn-20gMgO-15gCn (D7) had the lowest corrosion rate value of 0.5603 mm/y, with a protection efficiency of 89% on the substrate. Finally, among the deposited coatings, sample Zn-20gMgO-0gCn (E1) gave the highest corrosion rate values of 1.9137 mm/y, corresponding to a protection efficiency values of 64%. The study showed that the composite coatings were able to form protective barriers on the A36 steel substrate in the acidic media.

Keywords: Acid, Media, Nanocellulose, Corrosion, Coatings

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