merged

The Study of Lemon Grass as a Green Corrosion Inhibitor for Mild Steel in
Seawater
Muhammad Hafizzurdin bin Mohd Razali
Supervisor: Prof. Dr. Wan Mohd Norsani bin Wan Nik
Bachelor of Applied Science (Maritime Technology)
School of Ocean Engineering
Universiti Malaysia Terengganu
Cymbopogon citratus (lemon grass) is a common plant in South East Asia that rich in
phytochemical compounds such as flavonoid, phenolic and tannin. These compounds
play an important role for corrosion inhibition processes. The anticorrosion action of
lemon grass extract was evaluated for mild steel through immersion in seawater
medium. The mild steel was prepared in size of 25mm × 25mm × 3mm. The
immersion test will be conducted in seawater with different concentration of
lemongrass extract for duration of 60 days. Six characterizations will be conducted in
this study which is weight loss study, Fourier Transform Infrared (FTIR), UV-Vis
spectroscopy, Electrochemical Impedance Spectroscopy (EIS), adsorption isotherm
and SEM. The expected results from the test will be analysed to study the rate of
corrosion. The inhibitive action of lemongrass will be discussed on the basis of
adsorption of stable complex at the mild steel surface. The theoretical study involves
quantum chemical calculations is perform in lemongrass extract.
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