The Inhibitive Effect of Ficus Thonningii Leaves Extract In 1m HCL Solution as Corrosion Inhibitors on Mild Steel

Authors : H.C. Olisakwe; K.K. Ikpambeseb; T.D. Ipilakyaab; I. E. Ekengwu

Volume/Issue : Volume 7 - 2022, Issue 1 - January

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The inhibitive Effect of Ficus thonningii leaves using Maceration (Cold water) extraction method on mild steel in 1M HCl solution was investigated using weight loss and potentio-dynamic polarization method. The extract hasthe potentials to contribute to the development of renewable, biodegradable and environmentally friendly corrosion inhibitors. The Phytochemical analysis shows the presence of active anti corrosion constituents such as Alkaloids, Saponins, Flavonoids, Glycosides, Polyphenols and Tannins. Corrosion rates for all concentration of Ficus thonningii Leaves extract decreased steadily with increasing exposure time as well as extract concentration, except at extract concentration of 0.0g/dm3 where a rapid increase in corrosion rates was observed. The inhibitive efficiency of Ficus thonningii Leaves was 81.74% at room temperature, over immersion period of 240 hours at extract concentration 1.0g/dm3 , while at elevated temperatures, the inhibitive efficiency at immersion period of 8hrs, 1.0g/dm concentration was 51.46 at 298K and 43.95 at 328K. The correlation coefficient (R2 ) value was high (0.9971 -0.9989) at room temperature, exposure period 240 hours, it adheres to Langmuir adsorption Isotherm. Potentiodynamic polarization results confirms Ficus thonningii Leaves as good corrosion inhibitors, the open circuit potential time (OCPT) stability test shows that the leave extract was stable at high and low (1.0g/dm3 and 0.2g/dm3 ) concentration. Ficus thonningii Leaves can be registered as good substitute for corrosion inhibition of mild steel in HCl solution.

Keywords : Ficus Thonningii Leaves, Cold Water Maceration, Inhibition Efficiency, Langmuir Adsorption Isotherm And Mild Steel.


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