Modelling and Optimization Mechanism of Bougainvillea glabra Flower Extracton Zinc in 2 M Aqueous HCl using Response Surface Methodology

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International Journal of Research and Scientific Innovation (IJRSI) | Volume VII, Issue VII, July 2020 | ISSN 2321–2705

Modelling and Optimization Mechanism of Bougainvillea glabra Flower Extracton Zinc in 2 M Aqueous HCl using Response Surface Methodology

L. N. Emembolu, O.D. Onukwuli, V.N. Okafor
Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria

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Abstract:- Modeling and Optimization mechanism of flower extract of Bougainvillea glabra (GBF) on inhibition of zinc corrosion in 2 M aqueous HCL was studied using weight loss and Response surface methodology (RSM). The effects of temperature (303 -343K), time (2–10 hr), acid concentration (1.0 – 3.0 mols), and inhibitor concentration (0.2 – 1.0g/l) on inhibition efficiency was carried out using Response Surface Methodology.  The rate of corrosion of zinc in aqueous acid solution was successfully hindered by BFE. The predicted values was validated by applying the optimum settings of 0.025g/l inhibitor concentration, time of 6.250 hr and temperature of 313K. The predicted model was quiet in agreement with the obtained experimental data of 87.23%. The activities of BFE as readily available, low cost and as good corrosioe n inhibitor of zinc in acid media was shown is this study.

Keywords:- Acid corrosion, Bougainvillea glabra flower extract, modelling, inhibition efficiency, Response Surface Methodology.

INTRODUCTION

Zinc is a metal with numerous industrial applications and is mainly used for the corrosion protection of steel. It is one of the most important non-ferrous metals, which finds extensive use in metallic coatings. Zinc and zinc-coated products corrode rapidly in moist atmospheres forming white corrosion product (white rust). Zinc is most commonly used for cathodic protection of metals. Since zinc has a sufficiently negative standard electrode potential, it is highly reactive and acts as sacrificial anode in cathodic protection[1-3]. Despite its highly negative electrode potential, a protective layer, either as zinc oxide or zinc hydroxide, forms on the metal surface in near- neutral aqueous solutions under normal atmosphere conditions which prevents its further reaction. This layer provides a better corrosion resistance for zinc, thus zinc is used as a galvanizing element for iron and steel.