6 research outputs found
Mangifera indica Leave Extracts as Organic Inhibitors on the Corrosion of Zinc Sheet in 5 M H2SO4 Solution
The inhibition efficiency and adsorption characteristics of alkaloids,
flavonoids and tannins extracts of Mangifera indica 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\ub0C 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.
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