Acid Extracts of Ervatamia coronaria Leaves for Corrosion Inhibition of Mild Steel
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Date
2010
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Abstract
Corrosion inhibitors for acid cleaning processes are used to restrict
dissolution of the base metal and decrease acid consumption and hydrogen
gas evolution. Because of the toxic nature and high cost of some chemicals
currently in use, it is necessary to develop environmentally acceptable
and less expensive inhibitors. Natural products can be considered as a
good source for this puipose. An evaluation of the effective performance
of extract of Ervatamia coronaria leaves on the corrosion inhibition of
mild steel in 1 M HCl and 0.5 M H2SO4 at ambient temperature has
been made. Conventional weight loss and electrochemical measurements
were used for the evaluation. Electrochemical studies reveal that the
plant extracts act as mixed type inhibitors. The Etvatamia coronaria
(Nandhiyavatai) leaves extracts yielded a maximum of 98 % in acid
medium. Surface coverage values were tested graphically for suitable
adsorption isotherm.