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PROJECT TOPIC: RETARDATION OF ALUMINIUM AND MILD STEEL IN SULPHURIC ACID SOLUTION USING AQUEOUS EXTRACT OF MANGIFERAINDICA (MANGO) BARK
Department: Bio Chemistry
AMOUNT: 15,000
FORMAT: MS WORD
PAGES: 80
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ABSTRACT
Retardation of aluminium and mild steel in 0.2M sulphuric acid solution using aqueous extract of Mangifera indica(mango)bark has been carried out. Inhibitive effects of different concentrations (1.0g/dm3 to 5.0g/dm3) of Mangifera indica extract at 303K, 313K and 323K was premeditated using Weight Loss, SEM and FTIR methods. Results gotten indicated that percentage inhibition efficiency and half-life augmented with increasing inhibitor concentrations but decreased with augment in heat, with average inhibition efficiencies at 5.0g/dm3(69.31%) at 303K, (66.43%) at 313K and (57.88%) at 323K for aluminium, and (72.21%)at 303K, (61.42%) at 313K and (55.34%) at 323K for mild steel, correspondingly. The oxidization rate decreased with escalating inhibitor concentrations but augmented as heat augment, and outlined more dissolution(0.96x10–3mmpy–1) at 303K, (2.88x10–3mmpy–1) at 313K and (1.38x10–3mmpy–1) at 323K for mild steel, than (0.66x10–5mmpy–1) at 303K, (0.94x10–5mmpy–1) at 313K and (1.35x10–5mmpy–1) at 323K for aluminium coupons, correspondingly. The inhibition is accredited to the adsorption of Mangifera indica bark extract on the surface of the metal coupons and confirms corporeal adsorption mechanism. The half-life values augmented with rise in inhibitors concentrations but diminish with augment in temperatures for both metals studied. A first order reaction type of mechanism was recommended by the kinetic learn. The thermodynamic facts depicted the Temkin adsorption isotherm more apt for the adsorption of Mangifera indica on aluminium and mild steel at the three temperatures studied than the Langmuir adsorption isotherm which only fitted well for aluminium at 323K. Also, the SEM and FTIR exhibited the effectiveness of the inhibitor molecules on the aluminium and mild steel surfaces, to retard the dissolution of the two metals in 0.2M H2SO4 medium.
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