POTENTIODYNAMIC POLARIZATION STUDY OF MILD STEEL CORROSION INHIBITION IN 1.0M HCL AND 3.0M KOH MEDIA USING THAUMATOCOCCUS DANIELLI LEAVES EXTRACT
Abstract
his study 1s on the application of Thaumatococcus daniellii leaf extract as
orrosion inhibitor agent for mild steel. The effect of Thaumatococcus daniellii
‘af extract on mild steel corrosion in 1.0 M HCI and 3.0 M KOH was evaluated
sing potentiodynamic polarization technique at 303K. Scanning electron
ricroscopy (SEM) was used to study the adsorption of the inhibitor on the mild
teel surface. Potentiodynamic polarization results revealed that Thaumatococcus
aniellii leaf extract. Functioned as a mixed type inhibitor. Thermodynamic
arameters obtained indicated that Thaumatococcus daniellii leaf extract was
dsorbed on the steel surface by a physiochemical process and obeyed Langmuir
dsorption isotherm. The results showed that addition of the inhibitor effectively
educed the. corrosion rate of the metal alloys due to the adsorption on the metal
urface. The optical inhibiting efficiency of the Thaumatococcus daniellii leaf
xtract was 56.0 and 89.4 in HCI and 46.1 and 60.4 in KOH.
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