TITLE:
Analysis of the Effectiveness and Efficiency of the VA Solution on Offshore Pipelines and Ship Materials
AUTHORS:
Samson Nitonye, Prince Ugboga
KEYWORDS:
Vernomia amydalina, Inhibitors, Efficiency, Mild Steel, Corrosion, Environment
JOURNAL NAME:
Open Journal of Marine Science,
Vol.10 No.1,
December
19,
2019
ABSTRACT: The
analysis of the effectiveness and efficiency of Vernomia amydalina (VA) solution as an inhibitor on offshore
pipeline and Ship materials (Steel) was carried out with the preparation of the
specimen and the VA solution. The specimens were kept in a workable state and
the VA Solution (inhibitor) prepared from 1200 g
of bitter leaf was plucked, weighed and crushed separately. 600 cl of water was
added to each of the crushed leaves. The mixture was put in a filter cloth and
squeezed with hand to filter out the active concentration ingredients
responsible for corrosion inhibition, which produced a 2 M concentration
of VA extract solution. After the experiment was carried out the specimen was
air-dried and weighed to determine the corrosion rate and weight loss. This was
followed by the determination of the inhibitor efficiency at the different
hours and at different percentage/concentration of the VA solution on the
specimen. Results were obtained for different hours and at different percentage (0%, 5%, 10%, 15%, 20% and 25%
inhibitor)/concentration of the VA solution and graphs plotted. It was
observed that at the first week of exposure to corrosive medium there was a
substantial reduction in weight of coupons but over the next three weeks there
was a gradual decline in weight loss and the corrosion rate reduced evenly. It
can be said that the percentage of inhibitor to corrosive medium is
insufficient. From the graphs plotted, the inhibitor
efficiency is considered high when the concentration of the VA solution is high, which
implies a right percentage of inhibitor needs to be administered to obtain good
efficiency of the solution. Hence as the weeks go by it was clear that the
inhibitor was gradually losing its effectiveness. This means that inhibitors need to
be added at regular intervals to sustain the effectiveness
of the inhibitor. It is also of vital interest to apply the right concentration
of inhibitor since CR increases at
high concentrations and temperature. This process did not take into
consideration moving water.