Browsing by Author "Tesleem B. Asafa"

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Inhibition efficiency of gold nanoparticles on corrosion of mild steel, stainless steel and aluminium in 1M HCl solution
(Elsevier, 2021-01-01) Jamiu Kolawole Odusote; Adeolu Adesoji Adediran; R.A. Yahya; Adekunle Akanni Adeleke; J.G. Oseni; J.M. Abdul; Tesleem B. Asafa; S.A. Adedayo
In this study, the influence of gold nanoparticles (AuNPs) on corrosion behavior of mild steel, aluminium and stainless steel in 1.0 M HCl was investigated. The nanoparticles were previously characterized using FTIR, UV–Vis and TEM. Five concentrations of AuNPs solution (0 µg/ml, 5 µg/ml, 10 µg/ml, 15 µg/ml, 20 µg/ml) were added to 1M HCl. The corrosion rates of the metal samples and inhibition efficiency of the nanoparticles were analyzed using gravimetric (weight loss) and potentiodynamic polarization techniques. After 2000 h of exposure, gravimetric study showed that weight loss was reduced by ∼75% translating to ∼85% reduction in corrosion rate for the solution containing 20 µg/ml of AuNPs. The equivalent inhibition efficiency was 88%, 98% and 96% for aluminium, mild steel and stainless steel, respectively. Furthermore, potentiodynamic polarization results showed that the presence of AuNPs modified the mechanism of anodic dissolution by the formation of adsorption layer on the surface of the metal samples. These results indicated that AuNPs can be incorporated into existing inhibitors towards minimizing corrosion rate.
Inhibition potential of silver-gold nanoparticles on mild steel in 3.5% NaCl solution
(Engineering and Applied Science Research, 2023-01-01) Peter Pelumi Ikubanni; Adekunle Akanni Adeleke; Jamiu Kolawole Odusote; Tesleem B. Asafa; Sharafadeen K. Kolawole; Victor O. Ogbesanya; Jude A. Okolie
This study investigates the corrosion behaviour of silver-gold nanoparticles as an inhibitor on the degradation of mild steel in 3.5% NaCl (saline environment) using gravimetric analysis and potentiodynamic measurement. The inhibitor Ag-AuNPs was synthesized from Kola nut pod. Five different concentrations of the Ag-AuNPs solution (0, 5, 10, and 20 μg/ml) were added to the saline environment. The gravimetric result showed that inhibition efficiency of 83.33% was the highest at 20 μg/ml of Ag-AuNPs inhibitor concentration. The Tafel polarization result showed that the solution with 20 μg/ml of Ag-AuNPs had the highest inhibition efficiency of 99.465%. At 0 μg/ml of Ag-AuNps, the surface morphologies of the mild steel sample did not show the existence of Ag-AuNps constituent in the saline environment containing the nanoparticles. The outcome showed that the saline environment with 15 and 20 μg/ml of Ag-AuNPs could successfully limit the corrosion of the mild steel.
Mechanical properties and stress distribution in aluminium 6063 extrudates processed by equal channel angular extrusion technique
(Taylor and Francis, 2023-08-08) T.M. Azeez; L. O. Mudashiru; Tesleem B. Asafa; Adekunle Akanni Adeleke; Adeyinka Sikiru Yusuff; Peter Pelumi Ikubanni
This study investigated the effect of temperature and load on the mechanical properties and stress distribution in ECAE processed Al6063. Samples were extruded at temperatures of 350, 425 and 500 under applied loads of 1000, 1100 and 1200 kN and ram speed of 5 mm/s. Hardness and tensile strength of all the extrudates were measured with Rockwell hardness tester and universal testing machine, respectively. Stress distribution in the extrudates was simulated with qform software under different extended applied loads and temperatures. Experimental results showed that billet temperature influenced tensile strength and hardness more significantly than applied load. The grains in the extrudates also became more refined as billet temperature increased. Simulation results indicated that more uniform stress distribution with lower magnitude was observed in the extrudates with increased billet temperature. The hardness and tensile strength of the extrudates as revealed through the uniform stress distribution were enhanced.