Mild Steel Corrosion Inhibition in Ground Water by an Aqueous Extract of Ocimum Basilicum Leaves

CI of MS in ground water by AEOBL and Zn was herein investigated by WL method and PDP.It was concluded that MS corrosion resistance strengthened with AEOBL and Zn presence, due to an increase in LPR and a decrease in Icorr.Therefore, AEOBL and Zn inhibited metal corrosion and acted as good CI.SP showed a SE between AEOBL active principles and Zn ion.FTIR spectral analysis revealed that a protective film was formed on the MS surface by coordination of Fe 2+ ion with polar O atoms of phenolic and ether groups, pi electrons of the double bonds and O of methoxy group.Each functional group contributed to the protective film formation, which also contained Zn(OH)2.SEM images confirmed the formation of a protective film on the MS surface.PDP revealed that LPR increased from 760 to 4561 Ohm/cm 2 and Icorr decreased from 5.941 x 10 -5 to 1.006 x 10 -5 A/cm 2 .The findings may be useful in water towers where ground water is used for cooling.