ABSTRACT
This study investigated extract of sweet potato leaf as green corrosion inhibitor of mild steel in hydrochloric acid solution. Qualitative and quantitative analyses of the extract were carried out to identify and quantify its phytochemicals, while Fourier transforms infrared (FTIR) spectroscopy was used to detect the functional groups. Gravimetric method was employed in the corrosion control study. Effects of inhibitor concentration, temperature, and time on the weight loss, corrosion rate, inhibition efficiency, and degree of surface coverage were determined Analyses of the experimental results showed that phytochemicals of alkaloids, cardiac glycosides, flavonoids, phenolics, phytates, saponins, and tannins were present in the sweet potato leaf extract at various degrees. The extract contains more alkaloids (334.1±0.04 mg/100g) and saponins (320.2±0.31 mg/100g), indicating good corrosion inhibitive properties. The predominant functional groups include; ≡C-H stretch, C-H stretch, C-F stretch, N=O stretch, C-O stretch, C-H out of the plane, and C-H deformation. Quadratic model adequately defined the connection between inhibition efficiency of the extract and factors of the corrosion inhibition; inhibitor concentration, temperature and time. The optimum Inhibition efficiency of 82.58% was derived at a time of 3.91hrs, the temperature of 316.39 K, and inhibitor concentration of 0.80 g/L. Thermodynamic and adsorption parameters revealed that the adsorption of molecules of sweet potato leaf on the mild steel surface is exothermic and it transpired by physical attachment mechanism. Based on the performance evaluation, the sweet potato leaf extract should be applied as green (eco-friendly) corrosion inhibitor of mild steel structure in hydrochloric acid environment.
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