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Evaluation the Inhibition of Steel in
Petroleum medium by Tobacco Leaves Extract |
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This work involves study the corrosion
inhibition of steel in petroleum medium using alcoholic
extracted of Tobacco leaves with four concentrations of
extracted (1, 3, 5 and 7mL/L) at four temperatures over the
range 50 – 80 oC. Inhibition efficiency IE% results show that 7
mL/L is the best concentration, which it’s gave efficiencies in
the range of 72.69 – 76.78%. Polarization curves indicate that
Tobacco extract is an anodic inhibitor through the values of
corrosion potential. The increasing of concentration led to
increase the efficiency, while the increasing of temperature
results variation in efficiencies due to verity in cathodic and
anodic sites on steel surface. Arrhenius relationship shows the
increasing of activation energy in presence of Tobacco extract
and the highest energy was in the presence of 7 mL/L of extract.
AFM images illustrate the roughness of steel surface and they
showed that the roughness was lower compared with unhibited
surface. |
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