Browsing by Author "Adediran, Adeolu Adesoji"

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    Inhibitive Potentials of Bitter Kola Stem (BKS) on Mild Steel in Acidic Media
    (2017) Adediran, Adeolu Adesoji; Olawale, Olamide; Talabi, Segun Isaac; Busari, Yusuf O.
    This paper deals with the inhibitive potentials of bitter kola stem extract (BKS) on the deterioration of mild steel in 1 M HCl and 1 M H2SO4 using gravimetric method. Coupons of dimension 5.0 cm x 4.0 cm were immersed in test solutions of uninhibited acid and also in those containing various amount of BKS (10, 25 and 40 %v/v) at 30 oC and 60 oC respectively. The results showed that the extract addition reduced mild steel corrosion in the acidic media. The inhibitive efficiency of 92.07 % was attained at 40 %v/v in 1 M H2SO4 at 30 oC temperature, while the efficiency of 89.19 % was realized at the same concentration in 1 M HCl at 60 oC temperature. Hence, BKS can be considered as a good and safe inhibitor against mild steel corrosion in both acidic media.
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    Inhibitory action of Vernonia amygdalina extract (VAE) on the corrosion of carbon steel in acidic medium
    (Journal of Electrochemical Science and Engineering, International Association of Physical Chemists, 2017) Olawale, Olamide; Adediran, Adeolu Adesoji; Talabi, Segun Isaac; Nwokocha, Geraldine Chika; Ameh, Alewo Opuada
    This study investigates the inhibition potential of Vernonia amygdalina stem extract (VAE) on the corrosion of mild carbon steel immersed in 1 M HCl solution containing various concentrations of the inhibitor. The corrosion rate and inhibition efficiency were evaluated using mass loss and adsorption techniques. The results revealed that VAE efficiently inhibits the corrosion rate of mild carbon steel immersed in the acidic medium. The concentration of 0.6 g/L provides the highest inhibition efficiency of 78.1 %. The adsorption process was consistent with the physisorption mechanism and obeyed the Langmuir isotherm. The functional groups responsible for inhibition were identified using Fourier Transform Infrared (FTIR) spectra. The surface morphology of the corroded samples examined with Scanning Electron Microscope (SEM) revealed the presence of protective oxide layer. Inhibition efficiency was found depended on the presence of oxalate, phytate, tannins, saponins and flavonoids in the VAE. It has been concluded that VAE is safe, cheap and efficient corrosion inhibitor for mild carbon steel.