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Corrosion Inhibition Study of Aluminium in Hydrochloric Acid by Starch as
Green Inhibitor
Nur Nadhirah binti Mohamad Ghani
Supervisor: Dr. Chan Kok Sheng
Bachelor of Applied Science (Electronics and Instrumentation Physics)
School of Ocean Engineering
Inhibitory effects of three different types of starch; wheat starch, glutinous starch,
and sago starch, in 5 wt. % hydrochloric acid (HCl) solution with three different
concentrations which are 5 wt. %, 10 wt. %, and 15 wt. % of each type of starch on
aluminium has been evaluated using two different experimental technique; corrosion
rate and metallurgical microscope. The objective of this study was to study the
efficiency of starch as an inhibitor to reduce or slow down metal corrosion exposed to
the environment. This study shows the result of weight loss (%), corrosion rate
(mm/yr) and inhibition efficiency (%). The immersion time for the aluminium is 30
days. Immersion of aluminium sample results shown that there is significant reduction
in the corrosion rate of aluminium in the presence of inhibited solution compared to
blank solution, and inhibition efficiency was found to depend on the concentration of
starch solution.
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