Table 5 The effectiveness of IIE extract and a few known natural extracts for reducing steel corrosion in H₂SO₄ solutions is compared.

Artabotrys odoratissimus plant

mild steel

in 0.5 M H₂SO₄

1.25 g/L

48

Saraca ashoka extract

mild steel

in 0.5 M H₂SO₄

100 mg/L

49

rice straw extract

mild steel

in 1.5 M H₂SO₄

0.8 g/L

50

Maple leaves extract

Q235 steel in 0.5 M H₂SO₄

200 mg/L + 200 mg/L KI

51

Spathodea Campanulata leaves

mild steel

in 1.0 M H₂SO₄

1.5%

52

Irish ivy extract (IIE) extract

C-steel in 2.0 M H₂SO₄

0.5 g/L

This work