Corrosion inhibition of mild steel in sulphuric acid solution with tetradenia riparia leaves aqueous extract: kinetics and thermodynamics
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Date
2022-01-23
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ResearchGate
Abstract
One of the most successful ways for maximizing profit and lowering costs is to use mild steel
over other corrosion-resistant alloys. As a result, mild steel is the most commonly used metallic material
in many industries, and its corrosion resistance has received a lot of attention. The mild steel corrosion
inhibition using compounds derived from plants is the most practicable and preferable technique
because of their linked low cost and green chemistry credentials. This study reports on the kinetics and
thermodynamics of mild steel corrosion inhibition in sulphuric acid media utilizing Tetradenia riparia
leaves aqueous extract as a potential green inhibitor. The investigations were carried out using the
gasometric technique. The findings indicated that the corrosion inhibition efficiency (IE) increased with
increasing inhibitor concentration with an optimal value of 90.6% at 500-ppm. The increase in
temperature 298 to 338 K lowered the corrosion inhibition efficiency by only 4%. The adsorption
kinetics of the extract on the mild steel fit into Langmuir, Temkin, EL-awady, and Freundlich models,
but the Langmuir was the best. The results of this investigation show that adsorption of the extracted
chemicals on mild steel in a sulphuric acid solution is feasible and most likely involves a combination
of physical and chemical adsorption.
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Journal Article
Keywords
mild steel, corrosion kinetics, corrosion thermodynamics, Tetradenia Riparia, sulphuric acid