Corrosion Inhibition of Carbon Steel in HCl Solution by Some Plant Extracts

Table 2

Plant extracts used by us as corrosion inhibitors.

S. no.	Plant used	Active constituents	Common name	Inhibition efficiency (%)
(A)	Murraya koenigii			96.7
(1)			Murrafoline-I
(2)			Pyrayafoline-D
(3)			Mahabinine-A
(B)	Aegle marmelos			96.2
(1)			Skimmianine
(C)	Andrographis paniculata			98.1
(1)			Andrographolide
(D)	Syzygium cumini			94.2
(1)			Ellagic acid
(2)			Gallic acid
(3)			Quercetin
(4)			Cafeic acid
(E)	Pongamia pinnata			97.6
(1)			Karanjin
(2)			Pongapine
(3)			Kanjone
(4)			Pongaglabrone
(F)	Strychnos nuxvomica		Brucine	98.2
(G)	Piper longum			97.6
(1)			Piperine
(2)			Piplartine
(3)			Rutin
(H)	Moringa oleifera			98.6
(1)			Arginine
(I)	Citrus Aurantium			89.6
(1)			Threonine
(J)	Terminalia arjuna			88.9
(1)			b-Sitosterol
(K)	Ficus religiosa			88.8
(1)			Lanosterol
(L)	Bacopa monnieri			95.2
(1)			Bacoside A
(2)			Bacoside B