EXPERIMENTAL AND COMPUTATIONAL EVALUATION ON CORROSION INHIBITION PERFORMANCE OF ETHANOL EXTRACT OF PARKIA BIGLOBOSA (Jacq.) Br. ex G. Don. LEAVES ON MILD STEEL IN 0.5 M HYDROCHLORIC ACID

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EXPERIMENTAL AND COMPUTATIONAL EVALUATION ON CORROSION INHIBITION PERFORMANCE OF ETHANOL EXTRACT OF PARKIA BIGLOBOSA (Jacq.) Br. ex G. Don. LEAVES ON MILD STEEL IN 0.5 M HYDROCHLORIC ACID

EXPERIMENTAL AND COMPUTATIONAL EVALUATION ON CORROSION INHIBITION PERFORMANCE OF ETHANOL EXTRACT OF PARKIA BIGLOBOSA (Jacq.) Br. ex G. Don. LEAVES ON MILD STEEL IN 0.5 M HYDROCHLORIC ACID

*1Gashua, I. B. and Musa, H.
1Department of science Laboratory Technology,
School of science and technology, Federal Polytechnic, Damaturu.
*Corresponding author: bgashua@gmail.com

ABSTRACT

The ability of the methanol mild steel extract of parkia biglobosa leaves to inhibit mild steel corrosion in 0.1 M H2SO4 was examined. The inhibition efficiency of parkia biglobosa on the corrosion of mild steel in 0.1 M H2SO4 have been evaluated by conventional weight loss method, and surface analysis using 0.2-0.8 g/L (w/v) inhibitor concentration in temperature range of  303-323 K. Maximum inhibition efficiency of 90.37 % was obtained with optimum inhibitor concentration of 0.8 g/L at 303 K. The activation and free energies for the inhibition reactions support the mechanism of physical adsorption. The adsorption of parkia biglobosa extract on mild steel surface is endothermic, spontaneous and consistent with the Langmuir adsorption isotherm at all studied temperatures. FTIR and SEM analyses confirmed that the surface of mild steel was affected by the adsorption of parkia biglobosa onto the surface to form ferric- parkia biglobosa compounds.

Key words: Parkia biglobosa, inhibition, extract, mild steel, concentration.

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