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Lawsonia Inermis (Henna) As a Corrosion Inhibitor of Mild Steel in 0.15M
Hydrochloric Acid Solution
Syahidah Binti Isrofil
Supervisor: Dr. Nabilah Binti Ismail
Bachelor of Science (Chemical Sciences)
School of Fundamental Science
Lawsonia Inermis(henna) is a class of herbs commonly found in South East Asia
countries for art decoration. It also has high inhibitor properties due to the presence
of phenolic and flavonoid content. This study was conducted to determine the
properties and performance of henna to inhibit corrosion of mild steel in 0.15M HCl.
Henna extract was analyzed through FTIR and it shows lawsone as major compound,
which can slow down corrosion attack. The main components in lawsone are phenols
C6H5O-H, carboxylic acid COOH and alkenes C=C. Inhibitor properties of henna were
determined by the presence of phenolic, flavonoid and tannin by using phytochemical
screening test. Their great inhibition abilities make it possible to use henna as inhibitor.
Morphology was studied by using SEM and major cracks shown after day 60 which
means, henna can inhibit corrosion in long period. In conclusion, henna is an excellent
natural inhibitor for mild steel in 0.15M HCl.
472 | U M T U N D E R G R A D U A T E R E S E A R C H D A Y 2018