Table 2.

Corrosion inhibition efficiency of some plants.

S. no.	Plant name	Plant Part	Efficiency/ Conc. of extract	Medium used	Phytochemicals	Reference
1	Cryptostegia grandiflora	Leaves	87% at 500 ppm	1 M H2SO4	Hydroxyl cinnamic acid	26
2	Citrus aurantium	Leaves	89% at 10,000 ppm	1 M H2SO4	Phenolic compound	27
3	Chinese gosebery fruit	Fruit shell	92% at 800 ppm	1 M HCl	Sucrose and maltose	28
4	Borage flower	Flower	91% at 800 ppm	1 M HCl	Lactic acid and nicotinic acid	29
5	Parseley petroselium	Leaves	92% at 5000 ppm	1 M HCl	Chromen-2-one	30
6	Lannea coromandelica	Leaf	93.8% at 2000 ppm	1 M H2SO4	Flavonoids	31
7	Aloe Vera	Leaves	96% at 300 ppm	1 M H2SO4	Anthrones	32
8	Nauclea latifolia	Root	94% at 4000 ppm	1 M H2SO4	Saponins	33
9	Ficus racemose	Stem	90.5%at 2500 ppm	1N H2SO4	Triterpenes, sterols, long chain fatty acids	34
10	Cannabis sativa	Leaves	97.31% at 200 ppm	0.5 M H2SO4	Cannabinoids	35
11	Hemidesmus indicu	Leaves	98.05 at 4000 ppm	1 M H2SO4	Alkaloids, tannins, saponins and steroids	36
12	Coconut	Coir dust	94.3% at 500 ppm	0.5 M H2SO4	Saponins, flavonoids, tannins, phlobatannins, polyphenols and anthraquinones	37
13	Adhatoda vasica	Leaves and flower	98.9% at 3000 ppm	0.5 M H2SO4	Vasicine and vasicinone	38
14	Citrullus lanatus	Fruit	91% at 800 ppm	1 M HCl	Citrulline and nesperetin	39
15	Eucalyptus	Leaves	88% at 800 ppm	1 M HCl	Eucalyptone and ellagic acid	40