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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 19, No. 1, 2015, pp. 145-152
Bioline Code: ja15019
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 19, No. 1, 2015, pp. 145-152

 en Mangifera indica check for this species in other resources Leave Extracts as Organic Inhibitors on the Corrosion of Zinc Sheet in 5 M H2SO4 Solution
UGI, B.U.; EKERETE, JACKSON; IKEUBA, I.A. & UWAH, I.E.

Abstract

The inhibition efficiency and adsorption characteristics of alkaloids, flavonoids and tannins extracts of Mangifera indica check for this species in other resources leaves in controlling corrosion of Zinc sheet in 5 M hydrogentetraoxosulphate (VI) acid solution has been evaluated by gasometric method. The formulation consisting of 2 g/L of extract offers 96.2%, 85.3% and 70.6% inhibition efficiencies (alkaloids, flavonoids and tannins respectively) at 30°C to Zinc metal immersed in 5 M hydrogentetraoxosulphate (VI) acid solution. Judging from the trend in inhibition efficiency against temperature, it can be deduced that the adsorption process was physisoption being that corrosion rate increased while inhibition efficiency decreased with temperature. Adsorption mechanism followed the Langmuir adsorption isotherm being that the correlation coefficient was found to be approximately unity i.e. 0.9237.

Keywords
Langmuir adsorption; Mangifera indica; Zinc sheet; Alkaloids; Inhibition efficiency; Tannins; H2SO4

 
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