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A Study of the Corrosion Inhibition of Mild Steel in 0.5M Tetraoxosulphate (VI) acid by Alstonia boonei Leaves Extract as an Inhibitor at Different Temperatures
( Vol-3,Issue-12,December 2017 )


Evelyn.U.Godwin-Nwakwasi, Elachi.E.Elachi, Mercy.A.Ezeokonkwo, Lawrence.E.Onwuchuruba


Adsorption, Corrosion, Efficiency, Inhibition, Isotherm.


A comparative study of the corrosion inhibition performance of Alstonia boonei leaves extract in 0.5M tetraoxosulphate (VI) acid at different temperatures (30ᵒC, 50ᵒC and 70ᵒC) was undertaken. The results showed that Alstonia boonei leaves extract was more efficient as a corrosion inhibitor at 30ᵒC compared to temperatures of 50ᵒC and 70ᵒC.The adsorption of Alstonia boonei leaves extract was found to obey Langmuir adsorption isotherm at all temperatures (30ᵒC, 50ᵒC and 70ᵒC), but did not obey Freundlich adsorption isotherm at all temperatures. A study of the effect of temperature on corrosion rate and inhibition efficiency showed that corrosion rate increased with increase in temperature, while the inhibition efficiency decreased with increase in temperature.

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