Investigation of The Corrosion Inhibitory Ability of Urena Lobata Leaves Extract on Mild Steel in Basic Media

Maduelosi, Ngozi Jane; Barineka, Zorbari Kelvin; Iroha, Nkem

doi:10.22034/ijnc.2024.2028701.1396

Investigation of The Corrosion Inhibitory Ability of Urena Lobata Leaves Extract on Mild Steel in Basic Media

Document Type : Research Paper

Authors

Ngozi Jane Maduelosi ¹

Zorbari Kelvin Barineka ²

Nkem Iroha ³

¹ Department Of Chemistry, Rivers State University

² Chemistry, Science, Rivers State University, Port Harcourt, Nigeria

³ Chemistry, Science, Federal University, Otuoke, Bayelsa.

https://doi.org/10.22034/ijnc.2024.2028701.1396

Abstract

The Corrosion Inhibitive effectiveness of Urena lobata leaves extract on mild steel in 1M NaOH solution was investigated via gravimetric, Electrochemical and Surface analyses. Adsorption isotherms were investigated using the Langmuir and Freundlich plots. Gas Chromatography-Mass Spectrometric (GC-MS) technique was used for phytochemical screening. The protective effect of the leaves extract through immersion time, temperature and concentration were obtained. The results showed increasing inhibition efficiency with corresponding increase in extract’s concentration and protection was more at lower temperature. Using 2.5g/L of extract concentration, maximum inhibition efficiency of 100% was recorded. The corrosion rate increased with corresponding increase temperature in the basic medium. The adsorption process reduced as temperature increased thereby indicating physisorption. Chemisorption was detected since the Langmuir isotherms gave the best fit and observations from inhibition efficiency with varying temperature, activation energy and enthalpy of adsorption values confirmed physisorption thereby indicating extracts’ mixed properties. The inhibition efficiencies (% IE) were attributed to the phytochemical components (alkaloids, saponins, flavonoids, tannins, cynagenic glycosides) present in the extract. Urena lobata is an effective corrosion inhibitor of mild steel.

Keywords

Phytochemical

Temperature

Inhibition

Metal

NaOH

Subjects

Applied Chemistry

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