Corrosion Inhibition Effect of Lannea nigritana Leaves and Stem Bark Extract on Mild Steel in Acidic Medium
DOI:
https://doi.org/10.53555/ans.v2i4.104Keywords:
Adsorption, Corrosion inhibition,, Lannea nigritana,, gravimetric technique,, mild steelAbstract
Lannea nigritana leaves and stem bark extracts respectively were studied as corrosion inhibitor for mild steel in 1M HCl at temperatures 30oC, 50oC and 60oC using gravimetric technique. The extracts were found to inhibit corrosion of mild steel in acidic medium. The inhibition efficiency increased with increase in concentration of the extracts, with the leaves extract showing its maximum inhibition efficiency of 87.05% in 400mg/l concentration, while the stem bark extract showed its maximum inhibition efficiency of 88.39% in 600mg/l of the extracts. The inhibitory effect was as a result of the extract molecules ability to be adsorbed to the mild steel surface. The adsorption mechanism involved was discovered to be physisorptive between the temperature of 30oC and 50oC, but chemisorptive between 50oC and 60oC. Adsorption of extract molecules on mild steel surface was found to fit into Langmuir adsorption isotherm.
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