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Effect of Neem and Bitter Leaf Extract on the Corrosion Penetration Rate of 0.19% Medium Carbon Steel in Hydrochloric Acid

Authors: Oisakede MO, Okoro IS


An important economical method of protecting a metallic material like steel against deterioration from corrosive attack is by efficient application of inhibitors. At the core of this research is investigation of the corrosion responses or behavior of the medium carbon steel subjected to degrading media of hydrochloric acid of varied concentration. It was inhibited with Neem and Bitter-leaf extracts individually as well as Neem-Bitter leaf mixture which is the synergized extract. Varied concentration of Neem–Bitter leaf extracts as well as the Synergized extract, were tested as corrosion inhibitors for steel coupons in 1.5 M, 2.0 M and 2.5 M hydrochloric acid and subsequently analyzed via weight loss techniques. The maximum percentage inhibition efficiency was recorded as 90% at 1.5 M hydrochloric acid on the 28th day of immersion. This is an indication that the synergistic effect of neem-bitter leaf formulation used as inhibitor can produce a better result in reducing corrosion of hydrochloric acid when compared with the individual extracts of neem and bitter leaf.

Affiliations: Department of Mechanical Engineering, Faculty of Engineering, University of Benin, Benin City, Nigeria.
Keywords: Inhibitors, Synergized Extract, Carbon Steel, Bitter Leaf, Neem, Inhibition Efficiency
Published date: 2019/06/30

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ISSN: 2635-3342 (Print)

ISSN: 2635-3350 (Online)

DOI: In progress

ISI Impact Factor: In progress

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Chemical Engineering Department, Faculty of Engineering, University of Benin, PMB 1154, Ugbowo, Benin City, Edo State, Nigeria.